Stephen Cobeldick

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6 829 total contributions since 2014

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Answered
Automatically naming mat files with variable names
The cause of your difficulties lies in the unfortunate design decision to force meta-data into the variable names. Meta-data is ...

environ 2 heures ago | 1

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How can I merge rows into one with the same ID number?
Assuming that the non-diagonal values are exactly zero, then you could use varfun something like this: >> T = cell2table({'A',1...

environ 2 heures ago | 0

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Storing the generated matrices from a for loop into cell arrays and access them later to multiply them altogether
No cell array required: >> x = [2,5,23]; >> A = [9,8;7,6]; >> [n,n] = size(A); >> M = 1; >> for k=numel(x):-1:1; M = M*(A-x...

3 jours ago | 0

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Example got removed from the mathworks website
Unfortunately the Wayback Machine did not seem to have a copy of it, but it was still available in Google Cache, so I saved you ...

3 jours ago | 1

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Substitute string to double
>> A = {'0+1/R1','0-1/R1','1';'0-1/R1','0+1/R1+1/R2','0';'1','0','0'}; >> A = strrep(A,'R1','1000'); >> A = strrep(A,'R2','100...

3 jours ago | 0

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Answered
i want to write a code where equation is y=x*x. if y=100 what is the value of x?
>> f = @(x) x.^2 - 100; >> x = fzero(f,pi) x = 10

4 jours ago | 0

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delete column from matrix
Where M is your matrix: M = M(:,24:24:end)

4 jours ago | 0

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How can I differentiate between powermod(a,b,c) and mod(a^b,c)
>> 104^45 ans = 5.8412e+90 is well above flintmax, so it is very unlikely to exactly represent the integer that you think ...

4 jours ago | 0

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matrix creation from a loop
The simplest and most efficient solution is to just create one matrix: lat = zeros(6964,60) which you can then trivially acces...

4 jours ago | 1

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How can I index a 3D array like A(n,m,:) and get the result as a 1D array?
B = reshape(A(2,3,:),1,[])

4 jours ago | 0

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How to attribute a letter to unique combinaisons
There does not seem to be a convenient way to apply a function to table groups that does not also accumulate the results (e.g. l...

5 jours ago | 0

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How can I pass a anonymous function as an output to another function?
"Looks likes I am not allowed to do that . I would like to know how this can be achieved" Your attempted code has several bugs ...

5 jours ago | 0

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image a set of matrix variables after loading them in
Do not use load. Assign the imported data to an array, e.g.: theFiles(k).data = readmatrix(fullFileName); Now all of your impo...

5 jours ago | 1

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adding and subtracting elements in the same row in an nested for loop
"My assumption is that I have to do this using a nested for loop." Using array operations would be a much better use of MATLAB,...

5 jours ago | 0

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How can I sort a matrix to match another matrix?
>> [~,idx] = sort(B); >> [~,idx(idx)] = sort(A(:,2)); >> A = A(idx,:) A = 11 1 21 2 12 1 31 3 ...

5 jours ago | 1

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Maximization of a Function
The syntax .. = -@(..) is not valid for multiple reasons: the output of @ is a function handle. Arithmetic operations are no...

5 jours ago | 1

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How can I make multiple vectors the same length?
Because each of the input columns has their own domain, you will have to loop over the columns and interpolate each column separ...

6 jours ago | 1

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Answered
How do I read multiple float values in different columns from a txt-File with headers?
You can simply use any of the high-level file importing commands that your version of MATLAB supports, e.g. readtable, readmatri...

6 jours ago | 1

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Answered
Finding specific number of characters in vector
>> c = 'aryzbuk'; >> nnz(c~='b' & c~='r') ans = 5

6 jours ago | 0

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how to store the matrix value in cell array?
If C is a matrix, then you need to use curly braces to access the contents of the cell array T3: T3 = cell(1,10); for k1 = 1:n...

7 jours ago | 0

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Answered
How to transmit variables in problem structure
You need to parameterize the function: https://www.mathworks.com/help/matlab/math/parameterizing-functions.html For example us...

7 jours ago | 0

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from a column in a table, get row indices where value changes
The trick is to use diff, e.g. with the example data from your question: >> Y = [0;1;1;1;0;0;0;1;1;1;0;0]; >> D = diff([0;Y;0]...

8 jours ago | 1

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Answered
How to use do matrix operations without using symbols
Your approach makes this task complex and inefficient. In particular: Numbering variables like that is a sign that you are doin...

8 jours ago | 1

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Converting a text document to a CSV
str = fileread('temp2.txt'); spl = regexp(str,'[\n\r]+','split'); spl = regexp(spl,'\s*\.\s*','split'); spl = vertcat(spl{:})...

9 jours ago | 0

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How to use While loop
You need to keep the running total and the current value of y separate, e.g.: y = 1.1; t = y; c = 1; while t<1e5 c = c+...

11 jours ago | 0

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Answered
Convert rows an columns of 4D matrix into 2d matrix with rows and columns as index Ai_j
You will get an error because plot accepts matrices only (i.e. 3rd and higher dimensions must be scalar), but apparently you are...

11 jours ago | 0

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Answered
Matrix dimensions must agree error
Wrap each input with str2double, e.g.: Temp_Coke = str2double(input('What is the current temperature of the Coke (deg F)? ', 's...

11 jours ago | 0

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Answered
Generating matrix from another array
>> E3 = [2,1,0,4,25,19,2,2,3,3,4,5,6,7,8,7,19]; >> X = diag(cumsum(bsxfun(@eq,E3,E3(:)),1)); >> C = arrayfun(@(n)E3(X==n),1:ma...

11 jours ago | 0

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Answered
recursive function to calculate Max number.
Urmish Haribhakti's general approach is quite good, with a few small changes it will work correctly: function x = recmax(v) if...

11 jours ago | 2

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Field of a structure
M = mean(T.HV3) and then use writematrix.

13 jours ago | 0

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