Stephen Cobeldick

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7,108 total contributions since 2014

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Is it possible to make a loop where the the result is separate from the loop and have the result respectively with the input?
Use a cell array to store the data: p = 'Quantity of product you have bought today: '; n = str2double(input(p,'s')); c = cell...

4 hours ago | 0

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Why am i receiving "Error:Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters."? for S(K)>0
You need a WHILE loop, not a FOR loop.

5 hours ago | 0

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"If function" can't distinguish i ~= 1.6.
"This weird thing only happens when i=1.6." Nothing weird happens: you generate binary floating point numbers using two differe...

1 day ago | 1

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replacing loop with cell of index values
s = 1:100; c{1} = 1; c{2} = 1:5; c{3} = 2:2:10; out = cellfun(@(x)s(x),c,'uni',0); out{:} A well-written (i.e. correctly p...

3 days ago | 1

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Colors in Matlab as a vriable
Perhaps something like this: M = [1,0,0;... red 1,1,0;... yellow 0,1,0]; % green X = strcmpi(Auto.Farbe,{'red','ye...

7 days ago | 0

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Opening multiple .csv files using readtable
% opts is unchanged D = 'C:\Users\krist\OneDrive\Documents\MATLAB'; S = dir(fullfile(D,'*.csv')); for k = 1:numel(S) F =...

7 days ago | 1

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How to create matrix with other matrixes by joining them?
a = [1 2 3]; b = [4 5 6]; c = [7 8 9]; d = [10 11 12]; res = reshape([a;c;b;d],2,[])

8 days ago | 2

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saving the data in a variable
"...how to change the name of the file when matlab saves it" That is easy: https://www.mathworks.com/help/matlab/import_export...

8 days ago | 0

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How to iterate over cell array, creating only unique combinations of cells
data = {1,2;3,4}; n = numel(data); m = nchoosek(1:n,2) % each row is one combination pair. out = data(m) % output [idr,idc] ...

8 days ago | 0

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how to arrange data into array
Without an intermediate sparse array: R = [1;2;3;4]; C = [10;11;13;15]; V = [1e-5;5e-5;10e-5;15e-5]; % S = max([R,C],[],1);...

9 days ago | 0

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How to count the number of times that values changes?
A = [1;1;1;2;1;3;3;1;1] B = [NaN;cumsum(diff(A)~=0)]

10 days ago | 3

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Answered
Getting rid of loops
Logical indexing is much simpler than using loops: idx = A<1 & A>0; A(idx) = B(idx); A(A<C) = NaN; idy = B>100 | B<0; ...

10 days ago | 0

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How to conditionally merge rows in a table
lat = [45.67, 45.67, 56.89, 78.61]'; lon = [-66.45, -66.45, -65, -67]'; id = [202, 202, 201, 200]'; key = {'A', 'B', 'C', 'C'...

11 days ago | 0

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Increment components of vector till a desired limit
for k = 6:100 % or 105 maybe... you can check this. v = reshape(hankel(1:5,5:k),1,[]) end

11 days ago | 2

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Expected one output from a curly brace or dot indexing expression but there were 2 results
For your code to work the index tn4 must be scalar, but the error message tells us that it is not. Compare: S(1).blah = 1:3; ...

11 days ago | 0

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behaviour of nargout for anonymous functions
You get two different answers because you are testing two different functions: the function handle to addOne an anonymous func...

11 days ago | 0

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Combining cell arrays with empty doubles
% slightly more complex example data: a = {[],1;[],[]}; b = {[],[];2,[]}; c = {[],[];[],NaN}; % tmp = cat(3,a,b,c); [~,idp...

11 days ago | 2

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How to properly extract dataset and load in new file? Keep getting error.
There is no data field because you saved the array using the name Xs. So you need to use the field Xs (and get rid of the superf...

11 days ago | 0

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How do I insert data into new format based on row positions?
data = [8; 7; 1; 5]; datarowpositions = [0; 0; 0; 4; 0; 1; 0; 2; 0; 0; 3; 0]; desired = datarowpositions; desired(datarowposi...

12 days ago | 0

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naming using a string function
The MATLAB approach: N = numel(files); C = cell(1,N); for k = 1:N F = fullfile(files(k).folder,files(k).name); C{k}...

12 days ago | 0

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how to iterate?
I don't see why any iterations are required, vectorized code will do this quite easily: A = [-120449852, -107496428]; B = [-10...

12 days ago | 0

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Repeat a string with a delimiter
A = 'abc'; B = join(repmat({A},1,3),', '); B = B{1} C = join(repmat(string(A),1,3),', ') % string output! D = sprintf('%1$s,...

12 days ago | 0

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Remove parenthesis and the contents inside from a string
A = 'abc (ABC)'; B = regexp(A,'^\w+','once','match')

12 days ago | 0

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Programmatically change function input
Using a character vector is entirely the wrong approach. The correct approach is to use a comma-separated list: tt = synchroniz...

13 days ago | 0

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how can I display 3 row vectors as column vectors in front of eachother using fprintf?
a = [1,2,3]; b = [11,22,33]; c = [111,222,333]; fprintf('%d %d %d\n',[a;b;c])

13 days ago | 0

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Answered
Find rows in cell for each array between two values and create new cell with the values you just found
Using linear indexing to access the cell arrays only requires one loop: n_new = cell(size(n)); for k = 1:numel(n) idx = f...

14 days ago | 0

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Answered
How to multiply matrices using for loop?
z = 1; for k = 1:100 y = x.out(:,:,k); w = diag(fastexp(x.db(k))); z = z * y * w * y'; end

14 days ago | 0

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Answered
Create a new array by summing the columns of old array
The MATLAB approach, where M is your matrix: new = M(:,1:2:end) + M(:,2:2:end);

14 days ago | 0

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Reorder Matrix Rows from the row with the most nonzero elements to the row with the least nonzero elements
A = [... 0 1 2 4 7 12 17 22 27 33 42 0 0 1 3 6 11 16 21 26 34 43 0 1 2 4 7 12 17 22 28 35 44 0 0 1 2 8 13 18 23 29 36 45...

14 days ago | 0

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extract decimal number from a file name
The most efficient solution by far: C = {'NNN_2.5C3C_BlaBla'; 'NNN_2.5C3.5C_BlaBla'}; M = sscanf([C{:}],'%*[^_]_%fC%fC_',[2,In...

15 days ago | 0