Answered
save obj creates a large mat files, disagrees with whos
"Once I have reached the 2GB data size format v7 will no longer work." ??? Doc on save v7 says: 2^31 bytes per variable Ex...

1 month ago | 0

Answered
why does my m file not save correctly
The command save is used to store variables of the current workspace, i.e. save data. There is no simple command to save m-code...

1 month ago | 0

Answered
Why does converting a table to a struct increase memory usage by 15x??
What kind of structure do you expect? table2struct can create two kinds. struct array with one struct for each row of the tab...

2 months ago | 1

Answered
How to load text file to workspace variables?
"load to workspace as variables with string name in var and numeric value as val." There need to be a really good reason to do ...

2 months ago | 0

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

2 months ago | 1

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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 months ago | 0

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

2 months 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 %...

2 months ago | 0

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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

2 months 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...

2 months 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 ...

2 months ago | 0

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

2 months 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...

2 months ago | 0

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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"...

2 months 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...

2 months ago | 0

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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)))'...

2 months 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...

2 months 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...

2 months ago | 1

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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...

2 months 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...

2 months 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 ...

2 months 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...

2 months 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'...

2 months ago | 1

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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'...

2 months ago | 1

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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) - ...

2 months 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')...

3 months 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 =...

3 months 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 ) ...

3 months ago | 0

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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...

3 months ago | 0

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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...

3 months ago | 0

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