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Stephen Cobeldick


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6,194 total contributions since 2014

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Answered
For loop for unequal increment
You are confusing two different ways of defining filenames. Currently you use dir to get the actual filenames from the OS, but t...

24 hours ago | 0

Answered
How to split a string of digits into groups of three from right-to-left using only regular expressions?
With one regexp call (uses lookaround assertion): >> str = '12345678'; >> regexp('123456', '(^\d{1,2}(?=(\d{3})*$)|\d{3})','ma...

1 day ago | 1

Answered
Index 3D Array with 2D logical array
P = size(A,3); F = @(b,s)repmat(b,1,1,P)&reshape(ismember(1:P,s),1,1,P); % requires >=R2016b A(F(B,[1,2,3])) = A(F(B,[5,6,7]))...

1 day ago | 0

Answered
Finding three columns in one variable in another variable
I tried a simple vectorized solution of permute and sum of squares approach, but ran into "out of memory" issues: >> C = dlmrea...

1 day ago | 1

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Answered
How to extract numeric values from char
>> C = {'{"name":"rect","x":101,"y":30,"width":239,"height":244}'; '{"name":"rect","x":503,"y":88,"width":124,"height":165...

1 day ago | 1

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Answered
How to move values of matrix for 1 out of two rows?
>> M = [1,0,5,0;2,0,6,0;3,0,7,0;4,0,8,0] M = 1 0 5 0 2 0 6 0 3 0 7 0 4 0 8 0 >> M(2:2:...

2 days ago | 0

Answered
Creating RGB images with MATLAB
% 1. green at the left image border to black at the right border % 2. blue at the left image border to white at the right borde...

2 days ago | 1

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Answered
How can I fopen files in different directory
Do NOT follow advice of just adding more directories to the Search Path: this just pointlessly slows MATLAB down (MATLAB has to ...

2 days ago | 0

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Answered
How to use a vector to index another vector?
That function output is rather fragile, as there is no way to distinguish zeros (data) from zeros (place holders). This could ea...

3 days ago | 0

Answered
Shor Algorithm for prime factoring
You need to download bigmod from here: www.mathworks.com/matlabcentral/fileexchange/7908-big-modulo-function (the link is give...

3 days ago | 1

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Answered
find the nearest values
You were almost there, you just need to use the second output from min to make it easier: >> A = rand(1,2) A = 0.39011 0...

3 days ago | 1

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Answered
Selecting min value per row unless min value is repeated in another row.
Set the duplicate values to Inf/NaN, take the minimum of each row, then remove the Inf/NaN values: >> A = [1,2;1,3;2,3;5,6;3,7;...

3 days ago | 0

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Answered
Using a string shortcut for nested structure
For accessing a field of one specific structure (which can be nested) you should use dynamic fieldnames: https://www.mathworks....

4 days ago | 1

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Answered
How to save the result of stlwrite to a specific directory chosen by the user
TR = ... [F,P] = uiputfile('*.stl'); stlwrite(TR,fullfile(P,F))

4 days ago | 0

Answered
While loop not starting
Lets have a look at the first y value: >> f = @(x) 4*x^2 - 3; >> x(1) = 0.5; >> y(1) = f(x(1)) y = -2 And now look at your ...

5 days ago | 1

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Answered
FSOLVE requires all values returned by functions to be of data type double
The function handle definition is incorrect: @(B)@ourfun What you defined is an anonymous function which when called accepts o...

5 days ago | 1

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Answered
Indexing with two matrices
>> [C,~] = find(bsxfun(@eq,permute(A,[1,3,2]),permute(B,[3,1,2]))); >> C = reshape(C,size(B)) C = 2 1 2 4 3 4

5 days ago | 0

Answered
How to search through entirety of one field of a structure
The general solution is to use comma-separated lists: https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.h...

6 days ago | 0

Answered
Importing data with unequal number of column
This is very simple and efficient using fscanf: [fid,msg] = fopen('Data.txt','rt'); assert(fid>=3,msg) mat = fscanf(fid,'%f',...

7 days ago | 1

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Answered
Extracting second number after comma within parenthesis
Simply match all text from the comma to the whitespace: >> str = 'Toc(Clock Data Ref Time) : 0x91E6 (37350,5.976000e+005 s...

7 days ago | 0

Answered
Using strcmp with multiple inputs
You could use strfind or a regular expression to help you, e.g.: >> ixc = cellfun(@ischar,rw(:,3)); >> ixc(ixc) = ~cellfun('is...

7 days ago | 0

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Answered
declaring a new table
For historic and compatibility reasons if the variable does not exist before the dot-indexing allocates to it, then MATLAB will ...

7 days ago | 0

Answered
How to convert these char values to datetime format?
The error is caused by the milliseconds in start string: either you need to remove them from the input string, or specify them i...

8 days ago | 1

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Answered
Trying to modify a vector by removing alternate elements
There is no point in defining n when it always has exactly the same value as the loop iteration variable i. Get rid of one of th...

8 days ago | 1

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Answered
How to solve pre-allocating array?
Using numbered variables is a sign that you are doing something wrong. Accessing numbered variables is one way that beginners f...

9 days ago | 1

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Answered
How to pass a matrix (m, 1) to (m / 2.2)
>> reshape(V,2,[]).' ans = 1 2 3 4 5 6

11 days ago | 1

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Answered
How to generate 1 cross zero structure in Matlab??
B = reshape(A,1,0)

11 days ago | 1

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Answered
How to call a created function in a different function
Download my FEX submission num2ordinal and use it together with func2str: function out = myNewFunc(fun) val = str2double(regex...

13 days ago | 0

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Answered
flip an array with the use of vectors
"Any suggestions?" Use indexing (which in MATLAB starts from 1): >> a = [1,7,5,9,3,2,4,1] a = 1 7 5 9 3 2 4 ...

15 days ago | 0

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Answered
Using Read Table with a predefined Table size
Accessing files via the OS is slow, note that creating an intermediate file requires accessing a file minimum three times. A sim...

15 days ago | 1

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