Wolfram Mathematica

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Kuba

08:00

@C.E. not sure I got your point but this seems to be the answer: mathematica.stackexchange.com/a/43629/5478

1 hour later…

yode

09:22

@Szabolcs Hi,I want to let the Mathematica user use Opencv conveniently as your IGraphM by c++ link.

Could you help to do transplanter one or two function.Then I will do the rest refer your work.

3 hours later…

Vitaliy Kaurov

12:20

Don't remember if I shared this before...

*Visual Interface to the Wolfram Language*

http://community.wolfram.com/groups/-/m/t/1124967

Kuba

12:51

Q: Cloud CDF and HTTPRedirect

Cross posted on community.wolfram.com Question and requirements Is it possible to HTTPRedirect from a Cloud CDF via e.g. Button action? I need an interactive cloud cdf around it. The action would not only redirect but evaluate arbitrary code prior to that. If it matters the target page does n...

4 hours later…

Semiclassical

17:13

Trying to figure out how to do the following simple pattern match: Given a list of integers between 1 and n, give a second list of n booleans corresponding to whether the kth element appears in the first list.

so if n=8 then the list {1,3,5} should be mapped to the list {1,0,1,0,1,0,0,0}

The following works, but I have no idea if it's the best implementation:

`Table[Boole[MemberQ[#, k]], {k, 1, 8}] &

JasonB

17:30

@Semiclassical - another option,

test = {1, 3, 5};
Replace[Range[8], {x : Alternatives @@ test :> 1, _ -> 0}, 1]

Semiclassical

ah, nice.

JasonB

but really, your method is faster. I might rewrite it as this, but that's just coding style

If[MemberQ[test, #], 1, 0] & /@ Range[8]

Semiclassical

ah, nice.

J. M.

18:17

@Semiclassical Try Normal[SparseArray[Thread[{1, 3, 5} -> 1], 8]].

Semiclassical

ooo, sparse array.

thanks

4 hours later…

locometro

22:33

Hi there!

I need a help: I have a file.txt, and i need extract numbers of each set of matrix, see the

following

oh, I cant upload files sorry

the txt files are a mix of text, text, tex,...and a matrix of number{10 columns, 9 columns and x rows }, the x number is written in the 3rd column of each second row , for each dataset..

the 3rd column offirst row of numbers inform the numbers of rows for the matrix, in the example above , It would be '10 'rows.

i read a lot of post and tried many startegies, and nothing..:(

my tries:

$1 = Import[
"C:\\Users\\patolino\\Dropbox\\zotero\\FDL\\TestesFDLProject\\data\
\\FTP_detect_files\\FTPacceptinfo_000429000436_2017_06_25_01_51_44C.\
txt", "Table"];

Cases[$1, {_?NumberQ, __}]

openR = OpenRead[
"........\\FTPacceptinfo_000429000436_2017_06_25_01_51_44C.\
txt"];
ReadList[openR, Record, RecordSeparators -> "\n", RecordLists -> True]

I need each matrix, separated: {matrix 1, matrix2, etc...}

the matrix have 8 columns