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per isakson


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2.092 total contributions since 2010

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Answered
read a matrix from a text file
Since the text file looks like m-code it tempting to treat it as such. It's only the ellipsis that are missing. %% chr = file...

alrededor de 1 hora ago | 0

Answered
how can i give output of a python file as input to a matlab matrix
I wonder if it's allowed to use eval here? %% chr = fileread('cssm.txt'); A = eval( chr ); >> whos A Name Size ...

alrededor de 2 horas ago | 0

Answered
Varargout - How to realize function call
Something like this function varargout = test( j, k ) out1= nargin; out2 = j-k; if out2 == 10 out3 = 5;...

alrededor de 4 horas ago | 0

Answered
How many times does each combination of numbers appear?
"get it to tell" depends on what the little word "it" refers to. The function randi() cannot tell that. Try this as a start %...

alrededor de 5 horas ago | 0

| accepted

Answered
Error using - Matrix dimensions must agree.
I get a different error. One reason for the difference in the wording is that we run different releases of Matlab(?). I run R201...

2 días ago | 0

Answered
How do I save each iteration of a loop into a matrix?
Replace for i=0:n c=circshift(p, [0, i]); end by c = nans(n,1); for i=0:n c(i)=circshift(p, [0, i]); end

3 días ago | 0

Answered
Using Load in a test methods makes the test pass
Looks like a bug to me, however in programs one ought to use the functional form S = load('matlab.mat'); In that case the test...

3 días ago | 0

Answered
Trouble reading the file with strread and textscan
"Illegal use of reserved keyword "end". " Deleting some code may leave a spurious end sometimes far to the right outside the ...

5 días ago | 0

Answered
Loop for sequence of text files
See How can I process a sequence of files?

5 días ago | 0

Answered
How to perform operations depending on a value in an array
This works accourding to your expectations - I think. %% C=[10,8,34,7,7,24,11,15,10,13,13,20,17,39,6,9,5,21]; data=2200; for...

6 días ago | 0

| accepted

Answered
Change folder vs change directory
Matlab issues the message that you refer to in "Change folder is the option that sometimes matlab ask before running the script"...

6 días ago | 0

Answered
How can I save data from features files into matrix?
I understand that "data for each feature for 500 images" is in ONE text file with 500 blocks of six rows. The format is illust...

7 días ago | 0

| accepted

Question


Regular expression. Are nesting of group operators supported?
Regarding Grouping Operators the function, regexp, doesn't behave the way I expected. >> cac = regexp( 'ABC', '((A)(B(C)))'...

7 días ago | 1 answer | 2

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answer

Answered
Question about column operator vectors
Doc says x = j:k creates a unit-spaced vector x with elements [j,j+1,j+2,...,j+m] ... x = j:i:k creates a regularly-sp...

7 días ago | 0

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Answered
how to run function 1000 times to find minimum
Something like S = struct( 'score', cell(1,1000), 'grouping', cell(1,1000) ); for jj = 1 :1000 S(jj).grouping = randomize...

8 días ago | 1

| accepted

Answered
Rename and save multiple .mat files.
"the name on the work space is the old name" What do you expect? It's the names of the variables contained in the mat-file. The...

8 días ago | 0

Answered
How to extract text from string at the same location, one line above
"Is there a better/more efficient way of achieving this?" No, I don't think so. However, speed depends on how "each line for ea...

8 días ago | 0

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Answered
Replace odd numbers with infinity
%% C = randi([100,200],3,6) is_odd = rem(C,2) == 1; D = C; D( is_odd ) = inf returns C = 117 103 107 159 122 ...

8 días ago | 0

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Answered
Using dir() without changing directory?
Use an absolute path rather than a relative path (as proposed in the comments). It's easier to get it right. Thus try sad = di...

10 días ago | 0

Answered
how can I read file from a different directory
If you know the full directory name of 'b' use that, i.e chr = fileread( fullfile( 'c:', 'full', 'directory', 'name', 'of', 'b'...

10 días ago | 1

| accepted

Answered
creating a matrix in matlab using a text file
It's the brackets, [], that confuses Matlab. Try A = readmatrix( 'output.txt', 'Whitespace',' []' ); I have R2018b so I can'...

11 días ago | 1

| accepted

Answered
Nested for loop not iterating
I'm just guessing. Replace a_p = agrid(i) b_p=bgrid(j); fhat(i,j)=(a_p(i))-(b_p(j)).*magrange; by fhat(i,j) = ( agrid(i) - ...

12 días ago | 0

Answered
Previously accessible file is now inaccessible
You need to close the file after reading, add fclose( fileID ) after filedata = textscan(fileID, '%s %s %s %s %s %s %s %s')...

alrededor de 1 mes ago | 0

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Answered
How to convert all the rows containing char values to numbers in a table without for loop?
Replacing str2num by str2double might help. str2num uses eval(), which is slow. str2double takes arrays as input. %% cac =...

alrededor de 1 mes ago | 0

Answered
How to extract a vector from a matrix and save in workspace?
"can I use them in a loop using their names" NO but you can loop over the columns of the matrix for jj = 1 : size( M, 1 ) ...

alrededor de 1 mes ago | 0

| accepted

Answered
Why eval seems to be faster than other alternatives in this example?!
Testing is tricky >> Untitled5 Elapsed time is 0.167926 seconds. Elapsed time is 0.007457 seconds. Elapsed time is 0.010043...

alrededor de 1 mes ago | 0

| accepted

Answered
how do I substitute all negative values in a vector with a random number between 0 and 2
One way >> Y = randi( [-4,4], 1,12 ); % sample vector >> isneg = Y < 0; >> Y( isneg ) = 2*rand( 1, sum(isneg) ) Y = Co...

alrededor de 1 mes ago | 0

Answered
Alternative to using global for a very large array
"unjustified waste of memory" Matlab is smarter than that, see Avoid Unnecessary Copies of Data. If LUT is look-up-table a...

alrededor de 1 mes ago | 0

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Answered
Integer check
function isf = isflint( m ) % floating double only % % http://www.mathworks.com/company/newsletters/news_notes/pd...

alrededor de 1 mes ago | 0

Answered
Is vaderSentimentScores available in R2019a
No, vaderSentimentScores was Introduced in R2019b. See bottom of the page.

alrededor de 1 mes ago | 0

| accepted

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