I am making a space invaders game. Each invader has its position on the screen stored. This would form a nice grid of 5 rows with each 11 invaders.
There are 3 types of invader A, B, and C. A consists of 22 invaders, B also, and C 11. Because of this I could not use their positions alone to form the grid on the screen. So, I added variables for how many rows and columns there are and with these I could use a nested for loop to get the right amount of invadertypes.
Now, I have an idea for some kind of algorithm to get them to do something, but for that I need to store them in a certain way. How I'm thinking of doing it is to use a Dictionary<int, Tuple<Point, Invader>>, where int will be the index like in a list, Point will be used for storing row-column, and Invader for well, the invader.
Before I used a List to store invaders and so I could with a for loop access the invader I needed to perform an operation on. Like invaders[i].DoSomething().
I want to be able to still do that, and have not only the invader, but also what row-column it is occupying.
What are my options?
Why not add row / column variables to your invader class?
Related
So, I have a dataframe with 3D point cloud data (X,Y,Z,Color):
dataframe sample
Basically, I need to group the data according to the color column (which takes values of 0,0.5 and 1). However, I don't need an overall grouping (this is easy). I need it to create new dataframes every time the value changes. That is, I'd like a new dataframe for every set of rows that are followed by and preceded by 5 zeros (because single zeros are sometimes erroneously present in chunks of data that I'm interested in).
Basically, the zero values (black) are meaningless for me; I'm only interested in the 0.5 (red) and 1 values (green). What I want to accomplish is to segment the original point cloud into smaller clusters that I can then visualize. I hope this is clear. I can't seem to find answers to my question anywhere.
First of all, you should understand the for loop well. Python is a great programming language for using the code of any library inside functions and loops. Let's say you have a dataset and you want to navigate and control column a. First, let's start the loop with the "for i in dataset:" code. When you move to the bottom line, you have now specified the criteria you want with the code if "i[a] > 0.5:" in each for loop. Now if the value is greater than 0.5, you can write the necessary codes to create a new dataset with all the data of the row you are in. In terms of personal training, I did not write ready-made code.
Bit of a complex query but I will try to articulate it as best I can:
Essentially I have a list of objects for which I am trying to work out the probability of said items hitting particular points below on the seabed having been dropped at the surface. So there are two steps I need guidance on:
I need to define a custom function, ERF(a,b), where I need to refer to specified values dependent on the Item Number (see in the column names) in order to then use them as multipliers:
These multipliers can be found in a dictionary, Lat_Dev (note please ignore the dataframe column reference as this was a previous attempt at coding a solution, info is now found in a dictionary format).
The function then needs to be repeated for set iterations between a & b with the step size defined as 0.1m. This range is from 0-100m. a is the lower limit and b the upper limit (e.g. a = 0.1m & b = 0.2m). This is done for each column (i.e. Item_Num).
Hopefully the above is clear enough. Cheers,
I have a library of data that i need to pull specific rows from, at the moment i have an ID made up of several dropdown menus =$C$2&$F$2... that i compare to an index made up of a combination of column content: =[#Column1]&[#Column2]... that i then use to pull the right data for that instance with VLOOKUP.
Now however i need a much more varied set with more selections, 5 columns worth. That creates 16 sets for every index on the first column and will generate thousands of lines if i am to create one version of every permutation.
The best scenario would be a way to use a modular form of the selections above, if there is any input on X, Y and Z then it functions like now, but if Y and Z are empty it only pulls X. Easy in theory but i dont know the format it will have to take, and it gets even more complicated if i want X and Z for instance, or Y and Z, but still create a neat list of the selections.
An alternative might be a way to pull tables based on a selection, and make one table for every "part" of my query but i cant find a way to do that either.
What i need is any way to pull and combine several rows from a library (based on dropdown or similar input) and assembled in a neat list that i can print.
First post, and thanks in advance =)
I am unsure Excel would be able to do this automatically. I hope it can but maybe not.
I am trying to work with another member of staff in a different building. I have created a table trying to identify where the flow of some of the work is coming from. I am looking to try and count the amount of instances of text within a column. The problem is that the text can be pretty dynamic. As an example:
Consultant
a
a
b
a
b
a
b
z
c
c
c
Is there a way I can get excel to count the instances of text within the column, then create a table with the totals of the counts in it with labels.
I looked at pivot tables and that didn't seem to want to play ball.
The simplest way to do this is using COUINTIF
=COUNTIF(A:A,"a")
Which will simply tell you how many times "a" appears in the Column A.
You could easily duplicate this for every letter of the alphabet. Then use a summary table to display the results.
I'm building a string of text from different parts. Group A + GROUP B + GROUP C + GROUP D.
The text is put together in this exact order. Each sentence is unique.
I randomly take one sentence from each group and put them together so the total combination of unique text would be A*B*C*D where A,B,C,D are the number of sentences in their respective group.
My problem is that how do i track that i don't generate duplicates in this way and when to know that i have used up all possible combinations?
Storing all possible combinations somewhere seems rather inefficient way to do this. So what options do i have?
As random strings of text are pulled from each group, simply store the starting position of the sentence within the group along with the length into a container like a dictionary or perhaps HashSet. This would act as the key to the container. If the number of sentences in each group is small enough, you might be able to pack the data into a single integer or long value, otherwise define a structure or class for it. The code should look in the container to see if the random combination generated has already been used. If it has been used, then loop until a unique one has been found. If the total number of combinations is small enough such that the user might go through them all, then pre-calculate the total-count and check to see if the container reaches that count, in which case some sort of exit processing should be performed.