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

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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....

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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...

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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,:) ); ...

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Append rows to .mat file
See save(filename,variables,'-append') matfile Access and change variables directly in MAT-files, without loading into ...

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How to import textdata & data from Excel spreadsheet into Struct, using for loop?
What is the size of SBOB ? The for-loop % % Let this be for BOB % for i = [12:14,44:60,71:82] % filename1{i} = sprintf('...

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Method to GREEDILY select an optional text using regular expressions?
Try %% nfolders = { 'UD_epoch' 'UD_Epoch' 'epoch' 'Epoch' 'U...

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Calculating storage required to store any certain array(nxn) in the .Mat file ?
Try whos -file matlab.mat See whos, List variables in workspace, with sizes and types

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Assigning letters to numbers
"assign letters to numbers but in reverse (A = 26, B=25, etc)" Why not start by making a function that takes letters and return...

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Variable highlighting isn't working
I guess the problem is with the meaning of "Variables with shared scope". See Check Variable Scope in Editor The gui you refer ...

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Where should we install third-party toolboxes under Windows?
That depends Are you connected to a local network? Do you have a your own drive on a local server? Are the local workstation...

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Call function by path or namespace?
That's a good question. These two Matlab blogs Simple Namespaces and Brilliant Function Handles A conversation about managing ...

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[DEPRECATED] What frustrates you about MATLAB?
Background While experimenting with a function, which I had downloaded from FEX, I encountered the error No such file or dire...

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Is there a way to continue operation during input()?
Something like %% a script named cssm.m while true user_input = waitinput( 'prompt: ', 5, 's' ); if isnan( user_inp...

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