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how to produce a logical matrix using index matrix
Try logical_matrix = false( 1, 4 ); logical_matrix( b ) = true;

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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...

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Varargout - How to realize function call
varargout exercise. Try something like this function varargout = test( j, k ) out1= nargin; out2 = j-k; if out2 ...

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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 %...

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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

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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...

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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 ...

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

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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...

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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"...

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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...

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질문


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)))'...

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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...

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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...

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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...

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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...

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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 ...

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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...

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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'...

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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'...

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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) - ...

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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')...

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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 =...

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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 ) ...

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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...

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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...

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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...

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

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

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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...

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