This one has me stumped, and none of the other related questions here have given me clues. I'm using regexp to parse a string. When I print t afterward, it looks something like this:
t =
{
[1,1] =
{
[1,1] = HELLO
[1,2] = 1234
}
}
I would like to be able to pull out the HELLO and 1234. I've tried all different ways to access the elements in the nested matrix, but am not having any luck. I can't even find it in the Octave documentation! Can someone please help me out? Thank you!
I believe this is the answer -- regexp doesn't return a matrix, it returns a cell array. I just have to use {} to get access to the data. i.e. to get HELLO, it is t{1}{1}. To get 1234 it is t{1}{2}.
http://www.gnu.org/software/octave/doc/interpreter/Cell-Arrays.html
Related
I was trying to convert a match object to a string in perl6. The method Str on a match object is defined as:
method Str(Match:D: --> Str:D)
I would think I could use Str($match) to accomplish this. And it seems to convert it to a string, but I'm getting an error using the string with the following code:
my $searchme = "rudolph";
my $match = $searchme ~~ /.*dol.*/;
say $match.WHAT;
my $test1 = Str($match);
say $test1.WHAT;
say $test1;
With the output:
(Match)
(Str)
With the error:
Cannot find method 'gist': no method cache and no .^find_method in
block at .code.tio line 6
However, if I run:
my $searchme = "rudolph";
my $match = $searchme ~~ /.*dol.*/;
say $match.WHAT;
my $test1 = $match.Str;
say $test1.WHAT;
say $test1;
I get no error and the result:
(Match)
(Str)
rudolph
Is this a bug or me misunderstanding how it works?
Thanks for reading.
I'm writing this up as an answer even though it's actually an incomplete discussion of a bug, so not at all normal SO fare. The alternative of lots of comments doesn't seem better.
It's a bug. Perhaps you just golfed this.
dd $test1; instead of say $test1; is helpful in that it displays BOOTStr $test1 = (BOOTStr without .perl method).
Based on that I searched the rakudo repo for BOOTStr and that led to the above issue.
Golfing it further leads to:
say $ = Str(Match.new);
Note that these are all fine:
say Str(Match.new);
say $ = Int(Match.new);
say $ = Str(Date.new: '2015-12-31');
It appears to be a combination of leaking some implementation details regarding how Rakudo/NQP/MoarVM bootstrap; Match being an NQP object; Str() on that being wonky; and assigning it to a Scalar container (the $ is an anonymous one) making that wonkiness visible.
I'll add more when/if I figure it out.
My Groovy method has 3 parameters and the last 2 have default values. I want to skip the second parameter, and only provide values for the first and the third like so..
def askForADate(girlsName, msg = 'Will you go out with me?', beg = 'pretty please!!') {
println "$girlsName, $msg $beg!"
}
askForADate('Jennifer',,'Because I love you!')
Right now this prints out...
Jennifer, Because I love you! pretty please!!!
So it looks like it is plugging the value I am passing in for the third parameter into the second.
How to fix that?
As doelleri said, you'll need to write two version of thie method.
Unless you'll use some groovy goodness with named arguments!
def askForADate(Map op, girlsName) {
println "$girlsName, ${op.get('msg', 'Will you go out with me?')} ${op.get('beg', 'pretty please!!')}!"
}
askForADate(beg: 'Because I love you!', 'Jennifer')
Prints out: Jennifer, Will you go out with me? Because I love you!!
See http://mrhaki.blogspot.com/2015/09/groovy-goodness-turn-method-parameters.html for more details
This solution has the clear disadvantage of reordering the arguments as now the girls name is last in line.
I'm fairly new to gradle. How do I filter text in the following manner?
Pretend that the output/result I want to filter will be the two URLs below.
"http://localhost/artifactory/appNameIwant/moreStuffHereThatsDynamic"
> I want this URL
"http://localhost/artifactory/differentAppName"
> I don't want this URL
I want to put up a "match" variable that would be something like
variable = http://localhost/artifactory/appnameIwant
So essentially, the string will not be a perfect match. I want it to filter and provide back any URLs that start with the variable listed above. It cannot be a perfect match as the characters after the /appnameIwant/ will be changing.
I want to use a for loop to cycle through an array, with an if then statement to return any matches. For instance.
for (i=0; i < results.length; i++){
if (results[i] strings matches (http://localhost/artifactory/appnameIwant) {
return results[i] }
I am just filtering the URL strings themselves, not anything complicated inside the webpages.
Let me know if further explanation would be helpful.
Thanks so much for your time and help!
I figured it out - I just used
if (string.startsWith"texthere")) {println string}
A lot easier than I thought!
I have created several list enviroments. Then I wrote a function to draw several figures from the stored data and I would like to use a list name as a part of figure name.
list_xName <- list(aa = 1:10, bb = exp(-3:6), cc=-3:6)
drawL<-function(list_xName){
plot(list_xName$aa,list_xName$bb)
savePlot(filename=paste("fig_",xxxxxxx,sep=""),type="eps")
}
Instead of 'xxxxxxx' in savePlot I would like to have a name of the list.
I hope that my question is understandeble enough. Thank you in advance.
try deparse(substitute(list_xName))
I am new to Lua, and I am building a custom dissector for Wireshark. My situation is this:
The wireshark data consists of hex numbers such as 4321 8765 CBA9. What I would like to wind up with is (after it has been dissected) : CBA9 8765 4321.
What I have done so far is create a small function in Lua that will take these numbers individually, convert them to strings, and places them in the correct order.
function ReverseOrder3Numbers(hex_1, hex_2, hex_3)
local hex_1_int = hex_1:uint()
local hex_2_int = hex_2:uint()
local hex_3_int = hex_3:uint()
word1 = string.format("%04X", hex_1_int)
word2 = string.format("%04X", hex_2_int)
word3 = string.format("%04X", hex_3_int)
combined_string = "0x" .. word3 .. word2 .. word1
output = combined_string
return output
end
However, once I go to add this bunch to the tree, I get an error saying Lua Error: ...: calling 'add' on bad self (userdata expected, got string).
How can I get around this? Do I need a different approach entirely? I am not looking for anything complex or fancy. All I need to do is what I described. Any help would be appreciated.
There's nothing really wrong with ReverseOrder3Numbers (other than perhaps some missing local qualifiers). You should update your question to include the code that invokes add.
You might've accidentally used tree.add( ... ) instead of tree:add( ... ) (note the colon after tree).
Call tree:add() will send to the object 'tree' the direct link to 'tree' itself as first implicitly argument. And no matter how much args you will attach to this call or no one at all. Use tree.add() sintax if your 'add' method doesn't support self-link. In this case 'self' should be linked to the 'tree' object inside the 'add' method.
It's not clear what you pass to the function ReverseOrder3Numbers. But since you access theses parameeters with the uint method I assume that the parameters are tvb:range(x,y) results. If you want to change the order of the digits inside the individual values, you can use the endianess-aware methods:
function ReverseOrder3Numbers(hex_1, hex_2, hex_3)
local hex_1_int = hex_1:le_uint()
local hex_2_int = hex_2:le_uint()
local hex_3_int = hex_3:le_uint()
...
end
If you want to change the endianess of data that is added to the tree you should use the endianess-aware version of the add method.
tree:le_add(f_MyProtoField, tvb:range(x,y), ReverseOrder3Numbers(...))
I don't know the reason why le is suffix in the one case and a prefix in the other.