Community Profile

photo

per isakson


KTH

2,087 total contributions since 2010

Contact

per isakson's Badges

  • Editor's Pick
  • First Review
  • 5-Star Galaxy Level 4
  • First Submission
  • Revival Level 3
  • Ace
  • 36 Month Streak
  • Thankful Level 3
  • Knowledgeable Level 4
  • First Answer
  • Leader
  • Speed Demon
  • Promoter
  • Commenter
  • Solver

View details...

Contributions in
View by

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

23 hours 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...

1 day 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 ...

3 days ago | 0

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

3 days 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...

4 days 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"...

4 days 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...

4 days 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)))'...

5 days ago | 1 answer | 2

1

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...

5 days ago | 0

| accepted

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...

5 days 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...

5 days 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...

6 days ago | 0

| accepted

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 ...

6 days ago | 0

| accepted

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...

7 days 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'...

8 days 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'...

8 days ago | 1

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) - ...

9 days 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')...

30 days ago | 0

| accepted

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 =...

1 month 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 ) ...

1 month 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...

1 month 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...

1 month 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...

1 month ago | 0

| accepted

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

1 month ago | 0

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

1 month ago | 0

| accepted

Answered
Regexp lookbehind and lineanchors
"My intent is to match 'c' that is preceded by the beginning of a line and zero or more white character." In the character arra...

1 month ago | 0

| accepted

Answered
How to use a percentage number time with a matrix
matrix * (100-10)/100

1 month ago | 0

| accepted

Answered
Matrix Dimensions Must Agree
Is this a copy&paste error? W=imread('copyright1.png'); I=imresize(I,[300 300]); Replacing the line by W=imread('copyright1....

1 month ago | 0

Answered
Opening R2018b .m files in R2019b
Most likely the reason is that your search path of the R2018b installation is not carried over to the R2019b installation. See S...

1 month ago | 0

Answered
selecting rows from C with associated values in D, while using A and B values as references to produce E and F matrices
The script %% ixe = [1,4,7]; E = cat( 2, D(ixe), C(ixe,:) ); ixf = setdiff( [1:7], ixe ); F = cat( 2, D(ixf), C(ixf,:) ); ...

1 month ago | 0

Load more