Multi-Threading and Parallel Processing in Matlab - multithreading

I'm coding a project in Matlab, however I want the great efficiency and speed of my execution, for that sake, I want to use parallel processing threads in Matlab as I have multiple objects working or changing their states in a for loop. Is Multi-Threading is appropriate for this purpose? If so, where can I take start or can create a simple thread?
My Code:
% P=501x3 array
for i=1:length(P)
% I used position for example's sake, meaning object changing its state
Object1.position=P(i,:);
Object2.position=P(i,:);
Object3.position=P(i,:);
Object4.position=P(i,:);
% Mulitple objects changing their state on each iteration, after some calculation/formulation.
end
What I need is the basic structure of Multi-Threads according to my scenario if Threading is appropriate in my case. More suggestions for Parallel-Execution or fast processing are welcomed.
Edit1: Parray:
P =
-21.8318 19.2251 -16.0000
-21.7386 19.1620 -15.9640
-21.6455 19.0988 -15.9279
-21.5527 19.0357 -15.8918
-21.4600 18.9727 -15.8556
-21.3675 18.9096 -15.8194
-21.2752 18.8466 -15.7831
-21.1831 18.7836 -15.7468
-21.0911 18.7206 -15.7105
-20.9993 18.6577 -15.6741
-20.9078 18.5947 -15.6377
-20.8163 18.5318 -15.6012
-20.7251 18.4689 -15.5647
-20.6340 18.4061 -15.5281
-20.5432 18.3432 -15.4915
-20.4524 18.2804 -15.4548
-20.3619 18.2176 -15.4181
-20.2715 18.1548 -15.3814
-20.1813 18.0921 -15.3446
-20.0913 18.0293 -15.3078
-20.0015 17.9666 -15.2709
-19.9118 17.9039 -15.2340
-19.8223 17.8412 -15.1970
-19.7329 17.7786 -15.1601
-19.6438 17.7160 -15.1230
-19.5547 17.6534 -15.0860
-19.4659 17.5908 -15.0489
-19.3772 17.5282 -15.0117
-19.2887 17.4656 -14.9745
-19.2004 17.4031 -14.9373
-19.1122 17.3406 -14.9001
-19.0241 17.2781 -14.8628
-18.9363 17.2156 -14.8254
-18.8486 17.1532 -14.7881
-18.7610 17.0907 -14.7507
-18.6736 17.0283 -14.7132
-18.5864 16.9659 -14.6758
-18.4994 16.9035 -14.6383
-18.4124 16.8412 -14.6007
-18.3257 16.7788 -14.5632
-18.2391 16.7165 -14.5255
-18.1526 16.6542 -14.4879
-18.0663 16.5919 -14.4502
-17.9802 16.5296 -14.4125
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-17.7227 16.3429 -14.2992
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-17.0426 15.8456 -13.9957
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17.3949 -12.8640 0.2580
17.4911 -12.9376 0.2721
17.5876 -13.0111 0.2861
17.6843 -13.0848 0.3000


Ahsan,
I think parfor might be what you're looking for. It requires the Parallel Computing Toolbox (PCT) to use. It works like this:
parfor i = 1:length(P)
Object1.position = P(i,:);
end
Also, I would recommend using indexed structure fields, as I've done in the example below, as it increases the flexibility of any code that you write. Let me know if this doesn't work for you, and we'll try something else. I know another technique, but it's much messier. Good luck!
parfor i = 1:length(P)
Object(i).position = P(i,:);
end
Edit: Ok, this may not work because parfor is pretty particular. But it the general concept should apply to the problem you're trying to solve. I can't be more specific without knowing more about your specific problem. The key point is, inside a parfor, you must iterate something (Object, below) by the parfors iterator (i, below) and assign that thing a value. I'm not sure if you can use a for-loop inside a parfor, so the first example below may break. The point is, this is how you do parallel processing in MATLAB. Try this:
parfor i = 1:4
Object(i).position = P(i,:);
end
Edit 2:
parfor i = length(P)
Object1 = struct();
Object1.position = P(i, :);
end
Edit 3: Ok, one last thing. You can't use "sliced" structs (structs with fields) as input or output from a parfor so you have to do this:
parfor i = 1:length(P)
positionArray1(i) = P(i, :);
end
Object1 = struct('position', positionArray1);

Related

Confusion About Implementing LeafSystem With Vector Output Port Correctly

I'm a student teaching myself Drake, specifically pydrake with Dr. Russ Tedrake's excellent Underactuated Robotics course. I am trying to write a combined energy shaping and lqr controller for keeping a cartpole system balanced upright. I based the diagram on the cartpole example found in Chapter 3 of Underactuated Robotics [http://underactuated.mit.edu/acrobot.html], and the SwingUpAndBalanceController on Chapter 2: [http://underactuated.mit.edu/pend.html].
I have found that due to my use of the cart_pole.sdf model I have to create an abstract input port due receive FramePoseVector from the cart_pole.get_output_port(0). From there I know that I have to create a control signal output of type BasicVector to feed into a Saturation block before feeding into the cartpole's actuation port.
The problem I'm encountering right now is that I'm not sure how to get the system's current state data in the DeclareVectorOutputPort's callback function. I was under the assumption I would use the LeafContext parameter in the callback function, OutputControlSignal, obtaining the BasicVector continuous state vector. However, this resulting vector, x_bar is always NaN. Out of desperation (and testing to make sure the rest of my program worked) I set x_bar to the controller's initialization cart_pole_context and have found that the simulation runs with a control signal of 0.0 (as expected). I can also set output to 100 and the cartpole simulation just flies off into endless space (as expected).
TL;DR: What is the proper way to obtain the continuous state vector in a custom controller extending LeafSystem with a DeclareVectorOutputPort?
Thank you for any help! I really appreciate it :) I've been teaching myself so it's been a little arduous haha.
# Combined Energy Shaping (SwingUp) and LQR (Balance) Controller
# with a simple state machine
class SwingUpAndBalanceController(LeafSystem):
def __init__(self, cart_pole, cart_pole_context, input_i, ouput_i, Q, R, x_star):
LeafSystem.__init__(self)
self.DeclareAbstractInputPort("state_input", AbstractValue.Make(FramePoseVector()))
self.DeclareVectorOutputPort("control_signal", BasicVector(1),
self.OutputControlSignal)
(self.K, self.S) = BalancingLQRCtrlr(cart_pole, cart_pole_context,
input_i, ouput_i, Q, R, x_star).get_LQR_matrices()
(self.A, self.B, self.C, self.D) = BalancingLQRCtrlr(cart_pole, cart_pole_context,
input_i, ouput_i,
Q, R, x_star).get_lin_matrices()
self.energy_shaping = EnergyShapingCtrlr(cart_pole, x_star)
self.energy_shaping_context = self.energy_shaping.CreateDefaultContext()
self.cart_pole_context = cart_pole_context
def OutputControlSignal(self, context, output):
#xbar = copy(self.cart_pole_context.get_continuous_state_vector())
xbar = copy(context.get_continuous_state_vector())
xbar_ = np.array([xbar[0], xbar[1], xbar[2], xbar[3]])
xbar_[1] = wrap_to(xbar_[1], 0, 2.0*np.pi) - np.pi
# If x'Sx <= 2, then use LQR ctrlr. Cost-to-go J_star = x^T * S * x
threshold = np.array([2.0])
if (xbar_.dot(self.S.dot(xbar_)) < 2.0):
#output[:] = -self.K.dot(xbar_) # u = -Kx
output.set_value(-self.K.dot(xbar_))
else:
self.energy_shaping.get_input_port(0).FixValue(self.energy_shaping_context,
self.cart_pole_context.get_continuous_state_vector())
output_val = self.energy_shaping.get_output_port(0).Eval(self.energy_shaping_context)
output.set_value(output_val)
print(output)

Here are two things that might help:
If you want to get the state of the cart-pole from MultibodyPlant, you probably want to be connecting to the continuous_state output port, which gives you a normal vector instead of the abstract-type FramePoseVector. In that case, your call to get_input_port().Eval(context) should work just fine.
If you do really want to read the FramePoseVector, then you have to evaluate the input port slightly differently. You can find an example of that here.

How do I in FloPy Modflow6 output MAW head values for all timesteps?

I am creating a MAW well and want to use it as an observation well to compare it later to field data, it should be screened over multiple layers. However, I am only getting the head value in the well of the very last timestep in my output file. Any ideas on how to get all timesteps in the output?
The FloPy manual says something about it needing to be in Output Control, but I can't figure out how to do that:
print_head (boolean) – print_head (boolean) keyword to indicate that the list of multi-aquifer well heads will be printed to the listing file for every stress period in which “HEAD PRINT” is specified in Output Control. If there is no Output Control option and PRINT_HEAD is specified, then heads are printed for the last time step of each stress period.
In the MODFLOW6 manual I see that it is possible to make a continuous output:
modflow6
My MAW definition looks like this:
maw = flopy.mf6.ModflowGwfmaw(gwf,
nmawwells=1,
packagedata=[0, Rwell, minbot, wellhead,'MEAN',OBS1welllayers],
connectiondata=OBS1connectiondata,
perioddata=[(0,'STATUS','ACTIVE')],
flowing_wells=False,
save_flows=True,
mover=True,
flow_correction=True,
budget_filerecord='OBS1wellbudget',
print_flows=True,
print_head=True,
head_filerecord='OBS1wellhead',
)
My output control looks like this:
oc = flopy.mf6.ModflowGwfoc(gwf,
budget_filerecord=budget_file,
head_filerecord=head_file,
saverecord=[('HEAD', 'ALL'), ('BUDGET', 'ALL'), ],
)
Hope this is all clear and someone can help me, thanks!

You need to initialise the MAW observations file... it's not done in the OC package.
You can find the scripts for the three MAW examples in the MF6 documentation here:
https://github.com/MODFLOW-USGS/modflow6-examples/tree/master/notebooks
It looks something like this:
obs_file = "{}.maw.obs".format(name)
csv_file = obs_file + ".csv"
obs_dict = {csv_file: [
("head", "head", (0,)),
("Q1", "maw", (0,), (0,)),
("Q2", "maw", (0,), (1,)),
("Q3", "maw", (0,), (2,)),
]}
maw.obs.initialize(filename=obs_file, digits=10, print_input=True, continuous=obs_dict)

Eliminate one list according to another list in Python

I have two dimensional list like that
x_irp_group = [['x1_1_4', 'x1_2_4', 'x1_3_4', 'x1_4_4', 'x1_5_4', 'x1_6_4', 'x1_7_4', 'x1_8_4', 'x1_9_4', 'x1_10_4', 'x1_1_5', 'x1_2_5', 'x1_3_5', 'x1_4_5', 'x1_5_5', 'x1_6_5', 'x1_7_5', 'x1_8_5', 'x1_9_5', 'x1_10_5', 'x1_1_6', 'x1_2_6', 'x1_3_6', 'x1_4_6', 'x1_5_6', 'x1_6_6', 'x1_7_6', 'x1_8_6', 'x1_9_6', 'x1_10_6', 'x1_1_7', 'x1_2_7', 'x1_3_7', 'x1_4_7', 'x1_5_7', 'x1_6_7', 'x1_7_7', 'x1_8_7', 'x1_9_7', 'x1_10_7', 'x1_1_8', 'x1_2_8', 'x1_3_8', 'x1_4_8', 'x1_5_8', 'x1_6_8', 'x1_7_8', 'x1_8_8', 'x1_9_8', 'x1_10_8'], ['x1_1_8', 'x1_2_8', 'x1_3_8', 'x1_4_8', 'x1_5_8', 'x1_6_8', 'x1_7_8', 'x1_8_8', 'x1_9_8', 'x1_10_8', 'x1_1_9', 'x1_2_9', 'x1_3_9', 'x1_4_9', 'x1_5_9', 'x1_6_9', 'x1_7_9', 'x1_8_9', 'x1_9_9', 'x1_10_9', 'x1_1_10', 'x1_2_10', 'x1_3_10', 'x1_4_10', 'x1_5_10', 'x1_6_10', 'x1_7_10', 'x1_8_10', 'x1_9_10', 'x1_10_10', 'x1_1_11', 'x1_2_11', 'x1_3_11', 'x1_4_11', 'x1_5_11', 'x1_6_11', 'x1_7_11', 'x1_8_11', 'x1_9_11', 'x1_10_11', 'x1_1_12', 'x1_2_12', 'x1_3_12', 'x1_4_12', 'x1_5_12', 'x1_6_12', 'x1_7_12', 'x1_8_12', 'x1_9_12', 'x1_10_12']]
I wanna eliminate this two dimensional list if the elements in another one dimensional list like that
x_irp_eliminated_list = ['x1_1_4', 'x1_1_8', 'x1_1_12', 'x1_1_16', 'x1_1_19', 'x1_1_22', 'x1_1_26', 'x1_1_30', 'x1_1_34', 'x1_1_37', 'x1_1_43', 'x1_1_49', 'x1_1_55', 'x1_1_61', 'x1_1_68', 'x1_1_75', 'x1_1_81', 'x1_1_87', 'x1_1_92', 'x1_1_96', 'x1_1_101', 'x1_1_107', 'x1_1_112', 'x1_1_116', 'x1_1_121', 'x1_1_126', 'x1_1_131', 'x1_1_134', 'x1_1_137', 'x1_1_141', 'x1_1_145', 'x1_1_149', 'x1_1_152', 'x1_1_155', 'x1_1_160', 'x1_1_164', 'x1_1_169', 'x1_1_173', 'x1_1_181', 'x1_1_189', 'x1_1_197', 'x1_1_205', 'x1_2_8', 'x1_2_10', 'x1_2_13', 'x1_2_17', 'x1_2_21', 'x1_2_25', 'x1_2_28', 'x1_2_30', 'x1_2_34', 'x1_2_40', 'x1_2_45', 'x1_2_51', 'x1_2_58', 'x1_2_66', 'x1_2_71', 'x1_2_77', 'x1_2_82', 'x1_2_86', 'x1_2_91', 'x1_2_97', 'x1_2_102', 'x1_2_106', 'x1_2_111', 'x1_2_117', 'x1_2_122', 'x1_2_125', 'x1_2_129', 'x1_2_132', 'x1_2_135', 'x1_2_139', 'x1_2_143', 'x1_2_147', 'x1_2_151', 'x1_2_154', 'x1_2_157', 'x1_2_161', 'x1_2_166', 'x1_2_172', 'x1_2_177', 'x1_2_181', 'x1_2_189', 'x1_2_197', 'x1_2_205', 'x1_2_214', 'x1_3_1', 'x1_3_4', 'x1_3_8', 'x1_3_11', 'x1_3_15', 'x1_3_18', 'x1_3_22', 'x1_3_25', 'x1_3_28', 'x1_3_32', 'x1_3_35', 'x1_3_39', 'x1_3_42', 'x1_3_46', 'x1_3_49', 'x1_3_52', 'x1_3_56', 'x1_3_59', 'x1_3_63', 'x1_3_66', 'x1_3_70', 'x1_3_73', 'x1_3_77', 'x1_3_81', 'x1_3_85', 'x1_3_88', 'x1_3_91', 'x1_3_94', 'x1_3_97', 'x1_3_101', 'x1_3_105', 'x1_3_109', 'x1_3_112', 'x1_3_115', 'x1_3_118', 'x1_3_122', 'x1_3_126', 'x1_3_130', 'x1_3_134', 'x1_3_137', 'x1_3_140', 'x1_3_143', 'x1_3_147', 'x1_3_151', 'x1_3_156', 'x1_3_159', 'x1_3_163']
I write a code like that but it did not work well.
x_final = [i for i, j in zip(x_irp_group, x_irp_eliminated_list) if i == j]
I shorten the lists. Normally their sizes are much bigger than that

the list comprehension you have isn't working because you are zipping the elements together, which isn't what the operation represents (they are not parallel arrays) what you want is something along the lines of:
x_final = [i for i in x_irp_group[0] if (i not in x_irp_eliminated_list)]
Note that for a 2d list you may need to nest this like:
# writing normal loops you'd write:
# for row in x_irp_group:
# for i in row:
# if (...):
# so I typically try to indent the loops similarly since nested array comprehension
# gets complicated, honestly I'd likely prefer using generator functions for this anyway
x_final = [[i for i in row
if (i not in x_irp_eliminated_list)
]for row in x_irp_group
]
although know that i not in x_irp_eliminated_list will be very slow for a list, changing it to a set would improve performance:
x_irp_eliminated_set = set(x_irp_eliminated_list)
x_final = [i for i in x_irp_group[0] if (i not in x_irp_eliminated_set)]
Or if the lists are trivially sorted, then you could convert them both to sets, do a subtraction then sort it again:
x_final = [ sorted(set(x_irp_group[0]) - set(x_irp_eliminated_list)) ]
although if you have super giant lists this would probably be less desirable.

x_irp_eliminated_list_set = set(x_irp_eliminated_list)
x_last = [i for row in x_irp_group
for i in row
if (i in x_irp_eliminated_list_set)]
print(x_last[:30])
I used this for faster operation. Set approach made it faster. Thanks for that information. I learn one new thing. But it creates one dimensional list. I would like to create two dimensional list like original x_irp_group

PACF function in statsmodels.tsa.stattools gives numbers greater than 1 when using ywunbiased?

I have a dataframe which is of length 177 and I want to calculate and plot the partial auto-correlation function (PACF).
I have the data imported etc and I do:
from statsmodels.tsa.stattools import pacf
ys = pacf(data[key][array].diff(1).dropna(), alpha=0.05, nlags=176, method="ywunbiased")
xs = range(lags+1)
plt.figure()
plt.scatter(xs,ys[0])
plt.grid()
plt.vlines(xs, 0, ys[0])
plt.plot(ys[1])
The method used results in numbers greater than 1 for very long lags (90ish) which is incorrect and I get a RuntimeWarning: invalid value encountered in sqrtreturn rho, np.sqrt(sigmasq) but since I can't see their source code I don't know what this means.
To be honest, when I search for PACF, all the examples only carry out PACF up to 40 lags or 60 or so and they never have any significant PACF after lag=2 and so I couldn't compare to other examples either.
But when I use:
method="ols"
# or
method="ywmle"
the numbers are corrected. So it must be the algo they use to solve it.
I tried importing inspect and getsource method but its useless it just shows that it uses another package and I can't find that.
If you also know where the problem arises from, I would really appreciate the help.
For your reference, the values for data[key][array] are:
[1131.130005, 1144.939941, 1126.209961, 1107.300049, 1120.680054, 1140.839966, 1101.719971, 1104.23999, 1114.579956, 1130.199951, 1173.819946, 1211.920044, 1181.27002, 1203.599976, 1180.589966, 1156.849976, 1191.5, 1191.329956, 1234.180054, 1220.329956, 1228.810059, 1207.01001, 1249.47998, 1248.290039, 1280.079956, 1280.660034, 1294.869995, 1310.609985, 1270.089966, 1270.199951, 1276.660034, 1303.819946, 1335.849976, 1377.939941, 1400.630005, 1418.300049, 1438.23999, 1406.819946, 1420.859985, 1482.369995, 1530.619995, 1503.349976, 1455.27002, 1473.98999, 1526.75, 1549.380005, 1481.140015, 1468.359985, 1378.550049, 1330.630005, 1322.699951, 1385.589966, 1400.380005, 1280.0, 1267.380005, 1282.829956, 1166.359985, 968.75, 896.23999, 903.25, 825.880005, 735.090027, 797.869995, 872.8099980000001, 919.1400150000001, 919.320007, 987.4799800000001, 1020.6199949999999, 1057.079956, 1036.189941, 1095.630005, 1115.099976, 1073.869995, 1104.48999, 1169.430054, 1186.689941, 1089.410034, 1030.709961, 1101.599976, 1049.329956, 1141.199951, 1183.26001, 1180.550049, 1257.640015, 1286.119995, 1327.219971, 1325.829956, 1363.609985, 1345.199951, 1320.640015, 1292.280029, 1218.890015, 1131.420044, 1253.300049, 1246.959961, 1257.599976, 1312.410034, 1365.680054, 1408.469971, 1397.910034, 1310.329956, 1362.160034, 1379.319946, 1406.579956, 1440.670044, 1412.160034, 1416.180054, 1426.189941, 1498.109985, 1514.680054, 1569.189941, 1597.569946, 1630.73999, 1606.280029, 1685.72998, 1632.969971, 1681.550049, 1756.540039, 1805.810059, 1848.359985, 1782.589966, 1859.449951, 1872.339966, 1883.949951, 1923.569946, 1960.22998, 1930.6700440000002, 2003.369995, 1972.290039, 2018.050049, 2067.560059, 2058.899902, 1994.9899899999998, 2104.5, 2067.889893, 2085.51001, 2107.389893, 2063.110107, 2103.840088, 1972.180054, 1920.030029, 2079.360107, 2080.409912, 2043.939941, 1940.2399899999998, 1932.22998, 2059.73999, 2065.300049, 2096.949951, 2098.860107, 2173.600098, 2170.949951, 2168.27002, 2126.149902, 2198.810059, 2238.830078, 2278.8701170000004, 2363.639893, 2362.719971, 2384.199951, 2411.800049, 2423.409912, 2470.300049, 2471.649902, 2519.360107, 2575.26001, 2584.840088, 2673.610107, 2823.810059, 2713.830078, 2640.8701170000004, 2648.050049, 2705.27002, 2718.3701170000004, 2816.290039, 2901.52002, 2913.97998]

Your time series is pretty clearly not stationary, so that Yule-Walker assumptions are violated.
More generally, PACF is usually appropriate with stationary time series. You might difference your data first, before considering the partial autocorrelations.

Pull random results from a database?

I have been coding in Python for a 2 months or so, but I mostly ask for help from a more experienced friend when I run in to these kinds of issues. I should also, before I begin, specify that I use Python solely for a personal project; any questions I ask will relate to each other through that.
With those two things out of the way, I have a database of weaponry items that I created using the following script, made in Python 3.X:
#Start by making a list of every material, weapontype, and upgrade.
Materials=("Unobtanium","IvorySilk","BoneLeather","CottonWood","Tin","Copper","Bronze","Gold","Cobalt","Tungsten")
WeaponTypes=("Knife","Sword","Greatsword","Polearm","Battlestaff","Claw","Cane","Wand","Talis","Slicer","Rod","Bow","Crossbow","Handbow","Pistol","Mechgun","Rifle","Shotgun")
Upgrades=("0","1","2","3","4","5","6","7","8","9","10")
ForgeWInputs=[]
#Go through every material...
for m in Materials:
#And in each material, go through every weapontype...
for w in WeaponTypes:
#And in every weapontype, go through each upgrade...
for u in Upgrades:
ForgeWInputs.append((m,w,u))
#We now have a list "ForgeWInputs", which contains the 3-element list needed to
#Forge any weapon. For example...
MAT={}
MAT["UnobtaniumPD"]=0
MAT["UnobtaniumMD"]=0
MAT["UnobtaniumAC"]=0
MAT["UnobtaniumPR"]=0
MAT["UnobtaniumMR"]=0
MAT["UnobtaniumWT"]=0
MAT["UnobtaniumBuy"]=0
MAT["UnobtaniumSell"]=0
MAT["IvorySilkPD"]=0
MAT["IvorySilkMD"]=12
MAT["IvorySilkAC"]=3
MAT["IvorySilkPR"]=0
MAT["IvorySilkMR"]=3
MAT["IvorySilkWT"]=6
MAT["IvorySilkBuy"]=10
MAT["IvorySilkSell"]=5
MAT["CottonWoodPD"]=8
MAT["CottonWoodMD"]=8
MAT["CottonWoodAC"]=5
MAT["CottonWoodPR"]=0
MAT["CottonWoodMR"]=3
MAT["CottonWoodWT"]=6
MAT["CottonWoodBuy"]=14
MAT["CottonWoodSell"]=7
MAT["BoneLeatherPD"]=12
MAT["BoneLeatherMD"]=0
MAT["BoneLeatherAC"]=3
MAT["BoneLeatherPR"]=3
MAT["BoneLeatherMR"]=0
MAT["BoneLeatherWT"]=6
MAT["BoneLeatherBuy"]=10
MAT["BoneLeatherSell"]=5
MAT["TinPD"]=18
MAT["TinMD"]=6
MAT["TinAC"]=3
MAT["TinPR"]=5
MAT["TinMR"]=2
MAT["TinWT"]=12
MAT["TinBuy"]=20
MAT["TinSell"]=10
MAT["CopperPD"]=6
MAT["CopperMD"]=18
MAT["CopperAC"]=3
MAT["CopperPR"]=2
MAT["CopperMR"]=5
MAT["CopperWT"]=12
MAT["CopperBuy"]=20
MAT["CopperSell"]=10
MAT["BronzePD"]=10
MAT["BronzeMD"]=10
MAT["BronzeAC"]=5
MAT["BronzePR"]=3
MAT["BronzeMR"]=3
MAT["BronzeWT"]=15
MAT["BronzeBuy"]=30
MAT["BronzeSell"]=15
MAT["GoldPD"]=10
MAT["GoldMD"]=30
MAT["GoldAC"]=0
MAT["GoldPR"]=5
MAT["GoldMR"]=10
MAT["GoldWT"]=25
MAT["GoldBuy"]=50
MAT["GoldSell"]=25
MAT["CobaltPD"]=30
MAT["CobaltMD"]=10
MAT["CobaltAC"]=0
MAT["CobaltPR"]=10
MAT["CobaltMR"]=0
MAT["CobaltWT"]=25
MAT["CobaltBuy"]=50
MAT["CobaltSell"]=25
MAT["TungstenPD"]=20
MAT["TungstenMD"]=20
MAT["TungstenAC"]=0
MAT["TungstenPR"]=7
MAT["TungstenMR"]=7
MAT["TungstenWT"]=20
MAT["TungstenBuy"]=70
MAT["TungstenSell"]=35
WEP={}
WEP["KnifePD"]=0.5
WEP["KnifeMD"]=0.5
WEP["KnifeAC"]=1.25
WEP["SwordPD"]=1.0
WEP["SwordMD"]=1.0
WEP["SwordAC"]=1.0
WEP["GreatswordPD"]=1.67
WEP["GreatswordMD"]=0.67
WEP["GreatswordAC"]=0.5
WEP["PolearmPD"]=1.15
WEP["PolearmMD"]=1.15
WEP["PolearmAC"]=1.15
WEP["CanePD"]=1.15
WEP["CaneMD"]=1.15
WEP["CaneAC"]=0.7
WEP["ClawPD"]=1.1
WEP["ClawMD"]=1.1
WEP["ClawAC"]=0.8
WEP["BattlestaffPD"]=1.15
WEP["BattlestaffMD"]=1
WEP["BattlestaffAC"]=1.25
WEP["TalisPD"]=1.15
WEP["TalisMD"]=0.7
WEP["TalisAC"]=1.15
WEP["WandPD"]=0.0
WEP["WandMD"]=1
WEP["WandAC"]=1.33
WEP["RodPD"]=0.0
WEP["RodMD"]=1.67
WEP["RodAC"]=0.67
WEP["SlicerPD"]=0.67
WEP["SlicerMD"]=0.67
WEP["SlicerAC"]=0.67
WEP["BowPD"]=1.15
WEP["BowMD"]=1.15
WEP["BowAC"]=0.85
WEP["CrossbowPD"]=1.4
WEP["CrossbowMD"]=1.4
WEP["CrossbowAC"]=1
WEP["PistolPD"]=0.65
WEP["PistolMD"]=0.65
WEP["PistolAC"]=1.15
WEP["MechgunPD"]=0.2
WEP["MechgunMD"]=0.2
WEP["MechgunAC"]=1.5
WEP["ShotgunPD"]=1.3
WEP["ShotgunMD"]=1.3
WEP["ShotgunAC"]=0.4
WEP["RiflePD"]=0.75
WEP["RifleMD"]=0.75
WEP["RifleAC"]=1.75
WEP["HandbowPD"]=0.8
WEP["HandbowMD"]=0.8
WEP["HandbowAC"]=1.2
UP={}
UP["0PD"]=1.0
UP["1PD"]=1.1
UP["2PD"]=1.2
UP["3PD"]=1.3
UP["4PD"]=1.4
UP["5PD"]=1.5
UP["6PD"]=1.6
UP["7PD"]=1.7
UP["8PD"]=1.8
UP["9PD"]=1.9
UP["10PD"]=2.0
UP["0MD"]=1.0
UP["1MD"]=1.1
UP["2MD"]=1.2
UP["3MD"]=1.3
UP["4MD"]=1.4
UP["5MD"]=1.5
UP["6MD"]=1.6
UP["7MD"]=1.7
UP["8MD"]=1.8
UP["9MD"]=1.9
UP["10MD"]=2.0
UP["0AC"]=1.0
UP["1AC"]=1.1
UP["2AC"]=1.2
UP["3AC"]=1.3
UP["4AC"]=1.4
UP["5AC"]=1.5
UP["6AC"]=1.6
UP["7AC"]=1.7
UP["8AC"]=1.8
UP["9AC"]=1.9
UP["10AC"]=2.0
UP["0PR"]=1.0
UP["1PR"]=1.1
UP["2PR"]=1.2
UP["3PR"]=1.3
UP["4PR"]=1.4
UP["5PR"]=1.5
UP["6PR"]=1.6
UP["7PR"]=1.7
UP["8PR"]=1.8
UP["9PR"]=1.9
UP["10PR"]=2.0
UP["0MR"]=1.0
UP["1MR"]=1.1
UP["2MR"]=1.2
UP["3MR"]=1.3
UP["4MR"]=1.4
UP["5MR"]=1.5
UP["6MR"]=1.6
UP["7MR"]=1.7
UP["8MR"]=1.8
UP["9MR"]=1.9
UP["10MR"]=2.0
UP["0WT"]=1.0
UP["1WT"]=0.95
UP["2WT"]=0.9
UP["3WT"]=0.85
UP["4WT"]=0.8
UP["5WT"]=0.75
UP["6WT"]=0.7
UP["7WT"]=0.65
UP["8WT"]=0.6
UP["9WT"]=0.55
UP["10WT"]=0.5
def ForgeW(Material,WeaponType,UpgradeLevel):
"""The ForgeW function Forges a Weapon from its base components into a lethal tool."""
#Get the appropriate material stats...
OrePD=MAT[Material+"PD"]
OreMD=MAT[Material+"MD"]
OreAC=MAT[Material+"AC"]
#And weapon type stats...
SmithPD=WEP[WeaponType+"PD"]
SmithMD=WEP[WeaponType+"MD"]
SmithAC=WEP[WeaponType+"AC"]
#And apply the upgrade...
UpgradePD=UP[UpgradeLevel+"PD"]
UpgradeMD=UP[UpgradeLevel+"MD"]
UpgradeAC=UP[UpgradeLevel+"AC"]
#Then, add them all together.
ProductPD=(OrePD*SmithPD)*UpgradePD
ProductMD=(OreMD*SmithMD)*UpgradeMD
ProductAC=(OreAC*SmithAC)*UpgradeAC
return(ProductPD,ProductMD,ProductAC)
#Recall that ForgeW simply needs its three inputs, which we have a list of. So, let's make our
#database of weapon information.
OmniWeapData={}
#Go through every set of inputs we have...
for Inputs in ForgeWInputs:
#And create a key in the dictionary by combining their three names. Then, set that
#key equal to whatever ForgeW returns when those three inputs are put in.
OmniWeapData[Inputs[0]+Inputs[1]+Inputs[2]] = ForgeW(Inputs[0],Inputs[1],Inputs[2])
I would like to refer to the database created by this code and pull out weapons at random, and frankly I have no idea how. As an example of what I would like to do...
Well, hum. The code in question should spit out a certain number of results based on the complete products of the ForgeW function - if I specify, either within the code or through an input, that I would like 3 outputs, it might output a GoldKnife0, a TinPolearm5, and a CobaltGreatsword10. If I were to run the code again, it should dispense new equipment - not the same three every time.
I apologize if this is too much or too little data - it's my first time asking a question here.

"Take this... it may help you on your quest."
There is a library called random with a method called choice().
e.g.
import random
random.choice([1,2,3])
>>> 2
It sounds like you need one item from Materials, one item from WeaponTypes, and one from Upgrades.
Also, rarely is there ever a need for a triple nested FOR statement. This should get you started.

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