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Stephen Cobeldick


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6.600 total contributions since 2014

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Answered
How to sum the second poation data in an array (50000x2) with the same value in the first position
Method one: accumarray: >> [U,~,G] = uniquetol(A(:,1)); >> S = accumarray(G(:),A(:,2)); >> M = [U,S] M = 2.79314 0.141...

etwa 4 Stunden ago | 0

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Answered
read csv. convert char-array to matrix
Because MATLAB does not handle UCS-2 file I first converted your file to UTF-8 (attached). This imports all of the main matrix ...

etwa 7 Stunden ago | 0

Answered
Help with printing output
Instead of adding spaces manually you can set the fieldwidth: hours = [13,22,41]; x = [74.52,30.02,22.68]; y = [77.40,36.30,2...

ein Tag ago | 0

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Answered
Access all k-th elements of a n-dimensional array, where the k indexes are defined in a (n-1)-dimensional array.
>> S = size(A); >> [R,C,~] = ndgrid(1:S(1),1:S(2),1); >> X = sub2ind(S,R,C,idx); >> B = A(X) B = 1 11 3 13 ...

ein Tag ago | 0

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Answered
For loop using bin2dec conversion
This is MATLAB, you don't need a for loop! Method one: mtimes: >> V = [1,1,0,1,0,0,1,0]; >> N = 2; >> X = pow2(N-1:-1:0)*res...

4 Tage ago | 0

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Answered
Matrix Generation from Other Matrices
F = @(p)C*A^p*B; M = arrayfun(F,0:n-1,'uni',0); M = cumsum(cat(3,M{:}),3); M = reshape(permute(M,[1,3,2]),[],b); Tested: >>...

4 Tage ago | 0

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Answered
Replacing NaN's in column of a Matrix
Where M is your matrix: X = isnan(M(:,2)); M(X,2) = 250;

5 Tage ago | 1

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Answered
For loop goes longer than expected.
"Can you help me what is the cause for this behaviour?" Because that is the indexing that you used. You defined the loop itera...

5 Tage ago | 0

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Answered
Average of the nine surrounding cells
Use conv2 to calculate the averages, e.g.: out = matrix2.*conv2(matrix1,ones(3,3),'same')/9;

5 Tage ago | 1

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Answered
How to separate an array into 3
>> A = [11,22,33,44,55,66,77,88,99]; >> B = A(1:2:end-1) B = 11 33 55 77 >> C = A(2:2:end-1) C = 22 44 66 88...

5 Tage ago | 1

Answered
modify the matrix, rearrangement of elements
>> a = [2,4,7,11;7,9,5,54;2,5,7,9;12,41,45,21] a = 2 4 7 11 7 9 5 54 2 5 7 ...

7 Tage ago | 1

Answered
How can I create a new cell array from an existing one?
Country = strrep(Country,'"','')

7 Tage ago | 0

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Answered
Numerical error representing data in Format Long
"I have had a surprise making with this simple multiplication:" Nothing in that result is surprising. "The result must be 8.2e...

7 Tage ago | 1

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Answered
Is it possible to determine within a function the location of that function?
https://www.mathworks.com/help/matlab/ref/mfilename.html p = mfilename('fullpath') [p,n] = fileparts(p)

7 Tage ago | 0

Answered
How to list files in the directory
https://www.mathworks.com/help/matlab/ref/dir.html D = 'absolute/relative path to where the files are saved'; S = dir(fullfile...

8 Tage ago | 0

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Answered
Concatenate same fields in multiple structures in a loop using field names
Because all of the structures contain the same fieldnames they should be stored as one non-scalar structure: https://www.mathwo...

8 Tage ago | 0

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Answered
How to generate all combinations of N struct vectors.
It is much simpler when those structures are stored in one cell array, e.g.: C{1}(1).a = 5; C{1}(2).a = 9; C{2}(1).b = 2; C{...

8 Tage ago | 0

Answered
Call to function with multiple outputs
[~,y2] = f(x) https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-outputs.html

8 Tage ago | 0

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Answered
Saving previous values in a function to use them within it
https://www.mathworks.com/help/matlab/ref/persistent.html

8 Tage ago | 0

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Answered
Sort Data by Second Column
Use sortrows, e.g. where M is your matrix: M = sortrows(M,2); If you really want to use sort, then of course you will need to ...

9 Tage ago | 0

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Answered
how to plot a vector
"what's wrong with my code?" you preallocate a variable named Vho which you never use again. inside the loop you allocate to a...

10 Tage ago | 1

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Answered
Error : Undefined variable
You incorrectly transcribed the error message: the actual character shown is lower-case L, i.e. l, not a 1 like you showed. To a...

10 Tage ago | 0

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Answered
Suppressing ans in a function
To avoid the ans you must use a semi-colon when you call the function: str = encrypt(...); % ^ you need this s...

11 Tage ago | 0

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Answered
I keep getting two answers for my code
fconvg = int(k*j, x, 0, t) % ^ missing semi-colon This line should probably come after the if-end. Th...

12 Tage ago | 0

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Answered
Solving linear system 2 equations, 2 unknowns, not A = b*C form
Using a numeric solver or the symbolic toolbox is like using a sledge-hammer to crack open a tiny walnut! It is very simple to ...

12 Tage ago | 0

Answered
Button Colors and Shapes in GUIDE
http://undocumentedmatlab.com/articles/modifying-matlab-look-and-feel https://www.mathworks.com/matlabcentral/fileexchange/4086...

12 Tage ago | 0

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Answered
How to find the index of first and last nonzero elements in each column?
This works for any array, 2D, 3D, etc., and returns the requested linear indices: >> A = [0,0,0,0;0,0,0,0;1,0,4,8;2,0,5,9;3,1,6...

12 Tage ago | 1

Answered
Create one file from many files
D = 'absolute/relative path to where the files are saved'; N = 25; % number of files C = cell(1,N); for k = 1:N F = full...

12 Tage ago | 0

Answered
Randomly convert exact number of 1 to 0 in binary matrix
>> M = [0,1,0;1,0,1;1,1,1] M = 0 1 0 1 0 1 1 1 1 >> X = find(M); >> M(X(randperm(nu...

12 Tage ago | 1

Answered
need solution asap for my hw about summing each character in student number that we input the data
The MATLAB way: >> str = input('enter your student number here: ','s'); enter your student number here: 20758562 >> num = sum...

12 Tage ago | 0

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