Stephen Cobeldick

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7,204 total contributions since 2014

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Answered
how to form a new matrix (i.e. B) from two different matrices (i.e. a1, a2) knowing the indices of its origional matrix (indices of a)?
You can use those indices on the left-hand side. For example: a1 = [2,6,12]; x1 = [1,3,6]; a2 = [4,8,10,14]; x2 = [2,4,5,7];...

8 hours ago | 1

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Problem running an exe with path containing spaces, while saving command output
Specify double-quotes at each end of the path, e.g.: exe_path = '"C:\users\abc\test folder\test.exe"';

10 hours ago | 1

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Answered
Get English version of web Matlab support
As far as I am aware, there is no way to set this in the user account. The language/locale setting is stored in the cookies for...

1 day ago | 0

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Sort an Array with sortrows ( ) with two columns
There are probably nicer ways to do this, as this unfortunately changes the data itself. If required, you could use the index ou...

1 day ago | 1

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Answered
How to save arrays from a loop with variable names using iterator and how to perform element-by-element operations on arrays and save
"How can I incorporate the iterator i into the variable name?" Don't do that. The simpler and much more efficient approach is t...

2 days ago | 1

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matrix step shift in each row
A = [1,2,3,4,5]; B = toeplitz(A([1,end:-1:2]),A)

2 days ago | 0

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Producing a NaN only where there is a NaN, zero otherwise
X = [-inf, -1, -eps, 0, realmin, 2, 1+i, pi, flintmax, realmax, inf, NaN]; Y = 0./(X==X)

3 days ago | 3

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Numerical error using the "diff" function
V = [0,0,0,0.2,0.4,0.6,0.7,0.85,1,1,1]; D = diff(V); X = find(ismembertol(D,max(D)))

3 days ago | 0

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Cell array indexing question
%% Part A S = load('QuizGrades.mat'); grades = S.grades student_Names = "Student"+(1:14) student_IDs = 101:114; %% Part...

3 days ago | 0

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rearrange a matrix into a vector by blocks
M = [1,3,13,15,25,27;2,4,14,16,26,28;5,7,17,19,29,31;6,8,18,20,30,32;9,11,21,23,33,35;10,12,22,24,34,36] V = reshape(permute(re...

5 days ago | 0

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Answered
extract date from date time command in matlab
You don't need another command, you just need to change the format property: https://www.mathworks.com/help/matlab/ref/datetime...

5 days ago | 0

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Load different mat files using for loop
Assuming that each mat file contains exactly one variable of unknown name, then try this: D = 'D:\ABIDEdataset\Outputs\dparsf\n...

5 days ago | 0

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cell indexing, extracting rectangular subset
The simplest (and usually quite efficient) approach is to use a comma-separated list to create one cell array: tmp = vertcat(to...

6 days ago | 0

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Computation on arrays using loops
Y = [2.659717,2.656496,2.656496,2.656173,2.662294,2.661328,2.660039,2.620416,2.614295,2.606242,2.600765,2.600443,2.590779,2.5917...

6 days ago | 1

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Answered
How to load all the data in one folder
"I am wonder why it happened." Because you always load exactly the same file data (note the indexing you used): filename{1,1} ...

6 days ago | 1

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Tabulating a Function with exponential values and using fprintf
The loop is not required. By vectorizing the function you can simplify your code. https://www.mathworks.com/help/matlab/matlab_...

6 days ago | 0

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Why do I get "0x301 empty double matrix" when reading a cell array with data in it?
"Why do I get "0x301 empty double matrix" when reading a cell array with data in it?" Because you specified two header lines, b...

6 days ago | 0

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Answered
Function handles and passing parameters to ode solver
Like this: c_h = ... some value; c_v = ... some value; ... all the others variables myTorque = ... some value; % Now define...

7 days ago | 0

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Answered
Write matrix or array without overwriting
You are mixing up two different approaches to adding data in a loop: concatenation and indexing. Just pick one, e.g.: A = [A;te...

7 days ago | 0

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How to create a vector, knowing start, increment and number of values.
B = 6.333954480229592e-06; I = 3.906250000000000e-05; N = 537600; V = B + I*(0:N-1);

7 days ago | 0

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Answered
Appending data in multiple structures using a loop
D = 'absolute/relative path to where the files are saved'; S = dir(fullfile(D,'*.mat')); N = numel(S); for k = 1:N F = f...

8 days ago | 0

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Cell Array always includes a period as its first value
"So, why does fileinfo.name return those first 3 columns, and how can I get rid of them?" Because DIR returns exactly what the ...

8 days ago | 0

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How to use index for structure within for loop?
Using numbered variable names is a sign that you are doing something wrong. The simple and efficient approach is to use one non...

8 days ago | 0

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Why \n or newline doesn't work ?
"Do someone know why ?" The documentation states "For character array inputs, strcat removes trailing ASCII white-space charact...

8 days ago | 0

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Answered
Access multiple structure fields and put them in a new structure or vector
No, what you are asking for is not possible. This syntax: dataArray{1,2:10} creates a comma-separated list of separate arrays,...

10 days ago | 0

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Answered
Append to vector of different sizes in for loop
Simpler: S = load('test_file.mat') fun = @(b,e)S.TimeSeries_short(b:e); out = arrayfun(fun,S.ipts(1:2:end),S.ipts(2:2:end),'u...

10 days ago | 0

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Answered
i have loop and i need to Create a table for each loop
Use indexing rather than numbering the variables: N = the number of tables that you want C = cell(1,N); for k = 1:N C{k} ...

10 days ago | 0

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Answered
How can I find the difference between adjacent elements while ignoring the first value?
diff(data(2:end))

10 days ago | 0

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Answered
how to append matrix in a loop
s1 = [1,0,1,1,0]; s2 = [2,4,3,1,2]; v = repelem(s1,s2)

11 days ago | 0

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How to combine to identical 'for' loops with sequential varying variables ?
Numbering variables like that is completely the wrong approach and should be avoided. One better approach is to use a container...

11 days ago | 0

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