Stephen Cobeldick

Last seen: 1일 전

7,226 2014 이후 총 참여 횟수

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Plotting multiple lines on one graph
t = [0,0.000225,0.00045,0.00113]; z = 0:0.001:1; z = z(:); C = (sin(3*pi*z).*exp(-50*(3*pi)^2.*t))-(sin(9*pi*z).*exp(-50*(9*p...

약 9시간 전 | 0

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Improve speed reading in a .dat file
Some version of this is probably the fastest you can get: [fid,msg] = fopen('example.txt','rt'); assert(fid>=3,msg) for k = 1...

약 10시간 전 | 0

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Make specific columns of a matrix zero.
A = [1,2,3,4,5,6,7,8,9; 5,8,6,44,8,6,8,7,3; 9,8,7,6,5,4,3,2,1]; b = [1,4,5,9]; out = zeros(size(A)); out(:,b) = A(:,b)

약 10시간 전 | 1

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Multiply two terms at a set distance apart from each other in an array
The MATLAB approach: v = arr(1:end-23) .* arr(24:end);

약 15시간 전 | 2

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Save structure in Excel
F = fieldnames(dataset); N = 'myfile.xlsx'; for k = 1:numel(F) T = dataset.(F{k}); writetable(T, N, 'Sheet',F{k}) e...

약 16시간 전 | 0

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How to find the following pattern in my Char variable in the workspace?
Assuming no nested curly braces: str = '"costOfRevenue":{"raw":4751000000,"fmt":"4,75B","longFmt":"4.751.000.000"},"totalOtherI...

약 16시간 전 | 0

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Dir function with no file extension
Try specifying the fixed part of the filename: S = dir('Data*') and/or removing folder from the output: S = dir('*'); S = S(...

1일 전 | 0

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Why can't Matlab find functions from a project folder within another project folder?
Folders starting with "+" are package folders: https://www.mathworks.com/help/matlab/matlab_oop/scoping-classes-with-packages.h...

2일 전 | 0

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List comprehensions vs. functions
b = -30:30; b = b(b<-5|b>5); v = (-1).^b .* 0.2 .* (b+0.1) Python output: %[-5.98, 5.78, -5.58, 5.38, -5.18, 4.98, -4.78, 4....

2일 전 | 0

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"Local function name must be different from the script name" error
clear; % !!!!!!!!!! Delete this line !!!!!!!!! function [any, tri, sqr, rect] = main(number_of_sticks) % first line of the file...

2일 전 | 0

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How I concatenate two vectors?
Square brackets are the concatenation operator: you already used them to concatenate lots of scalar numbers into two vectors, no...

2일 전 | 0

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Indexing arrays of varying dimensionality.
C = num2cell(calc_ind); X = arr(C{:}) https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-lists.html https://ww...

2일 전 | 0

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How to create a structure of matrices within a loop
C = {'A','B','C'}; S = struct(); for k = 1:numel(C) S.(C{k}) = whatever end https://www.mathworks.com/help/matlab/matla...

3일 전 | 0

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How can I create a vector like this : X = [1, 2, 1, 2 ......
n = 9; v = 2-mod(1:n,2)

3일 전 | 2

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Arrange cell content in a specific order
One easy solution is to download my FEX submission natsortfiles: https://www.mathworks.com/matlabcentral/fileexchange/47434-nat...

3일 전 | 0

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matlab not recognizing variable defined in switch/case (Undefined function or variable)
The variable go_home is only defined in cases 14, 15, and 16. In all of the other cases it is undefined. You can probably resol...

4일 전 | 0

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How can I extract a slice from a multidimensional array?
The trick here is to define a cell array and then use a comma-separated list for the indices. For example: G = rand(7,6,5,4,3,2...

6일 전 | 0

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Accessing data in nested structure arrays
a.b(1).c.d = [1,2,3]; a.b(2).c.d = [3,4,5]; a.b(3).c.d = [5,6,7]; Either V = arrayfun(@(s)s.c.d(1),a.b) Or tmp = [a.b.c]; ...

6일 전 | 0

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Adding two matrixes with different row numbers.
A = [1,2,3,4,5,6,7,8,9,10; 10,11,12,13,14,15,16,17,18,19; 19,20,21,22,23,24,25,26,27,28]; B = [1,2,3,4,5,6,7,8,9,10; 2,4,6,8,10...

7일 전 | 2

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Why am I getting this error when trying to show a cell of an array? "Brace indexing is not supported for variables of this type"
dat is numeric, so you need to use parentheses: hi = dat(5,3) I already explained this in more detail in my response to your c...

7일 전 | 0

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How to make the last iteration of a for loop run differently?
It is simpler to just adjust the indices automatically, no IFs required: nmr = size(PT1,1) grp = 7200; nmg = ceil(nmr/grp); ...

7일 전 | 0

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Getting Data from a struct-array with other structs in it, without a loop
Using arrayfun to iterate over the elements of non-scalar structure Post_Processing.RunData: fun = @(s) s.PowerAnalysis.ECP.PF;...

7일 전 | 0

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How do I remove all filenames from my cellarray with .m ending, if else how do I save those with .bmp?
Change the DIR call to specify the file extension: filer = dir(fullfile(katalog,'*.bmp')); This is more efficient than getting...

7일 전 | 0

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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];...

8일 전 | 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"';

8일 전 | 1

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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...

9일 전 | 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...

9일 전 | 1

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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...

9일 전 | 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)

9일 전 | 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)

11일 전 | 3