Stephen Cobeldick

Last seen: Today

6,912 total contributions since 2014

Suspensa Vix Via Fit

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Answered
Assign values of .mat files into matrix
D = 'path to the folder where the files are saved'; S = dir(fullfile(D,'silomodresults*.mat')); C = {}; for k = 1:numel(S) ...

10 hours ago | 0

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Splitting an array up
Just use mat2cell, no need for reshape: >> M = rand(64,92690); % fake data >> N = 2048; >> S = size(M); >> V = repmat(N,1,fi...

15 hours ago | 2

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Subtraction inside a cell array
You will have to get the numeric data out of the cell array before performing any numeric operations on it. Although you did no...

18 hours ago | 0

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How to combine the multiple .mat files of ecg to get a single file.
This should get you started: D = 'path to the folder where the files are saved'; S = dir(fullfile(D,'*.mat')); for k = 1:nume...

20 hours ago | 0

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How to apply if statement in ode45 function?
c = max(0,c);

21 hours ago | 0

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Plot function with varying variable
The MATLAB approach is to use logical indexing, e.g.: z = 0:0.1:5; y = 2; f = z*y; idx = z>1; % logical index f(idx) = 2*z(...

22 hours ago | 0

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Sorting of points in 2D
Here is some simple code that that works quite nicely for your aerofoil. The code assumes that the top and bottom are both funct...

2 days ago | 1

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Answered
Why MATLAB asks for "more input arguments" in the function which is to be handled by ode45?
"However, exactly this is the syntax in the MATLAB documentation" I very much doubt that the MATLAB documentation shows any rec...

2 days ago | 0

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How to only replot part of a graph?
"Is there a way to only replot the changed point and the curve around it," Yes: you just need to change the XData and YData val...

2 days ago | 0

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floating point arithmetics, mathlab's interpretation of a . after a number
"Why doesn't e yield 0?" Because most of your values cannot be exactly represented using binary floating point numbers. The va...

3 days ago | 1

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How to create arrays from repeated matrix raws?
>> A = [1,2,3,4,5;1,2,8,9,10;1,2,13,14,15;11,12,16,27,18;11,12,19,29,21;11,12,22,23,24] A = 1 2 3 4 5 1 ...

4 days ago | 1

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Answered
Automatically Update Plots on GUI With Multiple Sliders
One simple approach is to have one "update" function in your GUI and call it from each individual callback: function slider1Cal...

4 days ago | 2

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Answered
Sort() function return wrong values
You are not assigning the sorted matrix to anything. You need to assign it to a variable, e.g.: minCell = minCell(s, :);

4 days ago | 0

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Answered
Find index of element closest to other index
>> B1 = [0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,1] B1 = 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 1 >> B2 = [1,1,...

5 days ago | 0

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Answered
How to read multiple image directory with for loop
Rather than fragile string concatenation and ungainly constructs involving int2str or num2str, the neat and efficient MATLAB app...

5 days ago | 1

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how to get the memory address of variable in matlab
Undocumented feature, has been around for many versions: format debug Examples of its usage: https://www.mathworks.com/matlab...

5 days ago | 0

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How to check if a element of a struct is empty?
fun = @(s) all(structfun(@isempty,s)); % check the fields of a scalar structure. idx = arrayfun(fun,Res_All_Meas); % indices of...

5 days ago | 0

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How to rename an image after processing with different parameters
The cause of the problem is that your inner loop repeatedly processes the same string of the cell array Outputs. So you just kee...

5 days ago | 0

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Answered
how to calculate mean of submatrices in a large matrix and print out a new matrix
>> M = [11,12,13,14;21,22,23,24;31,32,33,34;41,42,43,44;51,52,53,54;61,62,63,64] M = 11 12 13 14 21 22 23 2...

5 days ago | 0

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Answered
How to effectively check a list of variables for existence and then check "isvector"
"The data are loaded from "mat" files, some may exist but some may not." Once those .mat files are already loaded directly into...

5 days ago | 0

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Function is not working
The basic problem is that you keep repeating the same indexing, e.g.: resp = responses(targets==target); .. err = resp(target...

6 days ago | 0

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Extracting Data to a workspace
The MATLAB approach: >> [X,Y] = meshgrid(0:3,0:2); >> A = X+Y; >> M = [X(:),Y(:),A(:)] M = 0 0 0 0 1 1 0...

6 days ago | 0

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Answered
Creating a Matrix from a nesting For loop
The MATLAB approach: >> [Xm,Ym] = meshgrid(1:25,1:25); >> Zm = Xm.*Ym; >> surf(Xm,Ym,Zm) Giving:

7 days ago | 0

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Problem with plotting vector fields
"also the figure I get comes out to be emtpy" You need to use array operations, not matrix operations: >> [X,Y] = meshgrid(2:1...

7 days ago | 0

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Passing Structure Array of Parameters into Boundary Condition Function for PDEPE
You need to parameterize the function: https://www.mathworks.com/help/matlab/math/parameterizing-functions.html Usually the si...

7 days ago | 0

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Answered
Not enough input arguments
There are two main bugs that we need to fix: define the correct function outputs. call the function with input and output argu...

7 days ago | 0

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How to modify field any levels deep in a structure with a string
"i cant break the string into its fields and use something like app.(str1).(str2).str(3)..." You cannot use dynamic fieldnames ...

7 days ago | 0

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Answered
check if an array is equispaced
>> v = [1,2,3,4,5,6,7]; >> x = ~any(diff(v,2)) x = 1 >> v = [1,2,4,4.5,7]; >> x = ~any(diff(v,2)) x = 0

8 days ago | 1

Answered
Insert elements to cell array
g = g(:,[1,1:end]); g(:,1) = {M}

8 days ago | 0

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Answered
Regular expressions: extracting data after certain keywords
For such a large file I would get textscan to directly import the numeric data. With a few simple file commands you can also aut...

8 days ago | 0

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