Stephen Cobeldick

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7,132 total contributions since 2014

Suspensa Vix Via Fit

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Answered
fill matrix with all options of successive, increasing numbers 1-5
It might not be the fastest and you will probably run out of memory, but this works. I wrote it to return the results as rows of...

4 hours ago | 1

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Sum per 2 elements in vector
A = [1;2;3;4;5;6]; B = A(1:2:end) + A(2:2:end) or more generally: B = sum(reshape(A,2,[]),1).' or B = reshape(A,2,[]).' * o...

11 hours ago | 1

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Problem outerjoin two tables 20x1 ; 20x8
I don't see why outerjoin is required: newTable = [ArrayTime,ArrayZ]

11 hours ago | 0

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Matlab round the values and find function can not give the exact result(index)?!
"I used this expression format longE to consider the actual values" format longE does not show the "actual values", it just sho...

14 hours ago | 0

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Import data from bpmn file into one string/char value Matlab
The simple solution: https://www.mathworks.com/help/matlab/ref/fileread.html str = fileread(...);

15 hours ago | 0

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Getting extra parameters from ODE45 and the mystery transpose
Using the OutputFcn is a complex way to get the Fs values. The simpler approach is to run the ODE solver normally, and then run...

15 hours ago | 0

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Normalizing RGB coordinates in an image
You did not take into account the integer class that you are using. Most likely the image data is uint8, which supports values ...

16 hours ago | 0

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dynamically save a matrix to a structure
Do NOT use eval for trivial code like this. Your approach is slow, complex, inefficient, and not recommended. Rather than mess...

1 day ago | 0

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Conditionally select from array of struct by membership of a list in struct element
X(1).Members = [1,2]; X(1).Name = 'Group 1'; X(2).Members = [2,3]; X(2).Name = 'Group 2'; F = @(n)arrayfun(@(s)any(s.Members...

3 days ago | 0

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Can I somehow improve performance of str2double?
The fastest conversion uses low-level commands, e.g. sprintf and sscanf. Instead of this: C = {'1.2','3.4','5.6'}; V = str2dou...

3 days ago | 1

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How to sort one array based on the order of a second array?
As far as I can tell, the order of Q is irrelevant. A = ["1a","1b","1c","1d","1e","2a","2b","2c","2d","2e"]; % sorted B = ["A1...

3 days ago | 1

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Reshape array such that boundaries remain the same
x = [0, 1, 2, 1, 0]; y = [0, 0.5, 1, 1.5, 2, 1.5, 1, 0.5, 0]; xnew = interp1(x,linspace(1,numel(x),numel(y)))

3 days ago | 0

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Why am I getting "Array indices must be positive integers or logical values" error?
Consider this indexing: x1(i-j+1) What value does it have on the last iteration of the j loop? (hint: zero). i-j+1 % that ind...

4 days ago | 1

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Get unknown variable from mat-file
Given only one variable saved in the mat file: tmpC = struct2cell(load(filename)); myVar = tmpC{1}; Do not worry about the t...

4 days ago | 0

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Extracting the numbers from file names and listing them in a column
C = {'Rpma26siatBz 9.500000 Bx 0.000000mT WWait 2.000000Sec.Bzat9.5mT83.png',... 'Rpma26siatBz 9.500000 Bx 100.000000mT WW...

4 days ago | 0

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sum contents of array in groups of 10
Where V is your 1x3001 vector: M = sum(reshape(V(1:3000),10,[]),1)

4 days ago | 0

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How to append for each iteration not using cells?
Replace yield(p) = [yield(p); {helper(k)}]; with yield = [yield; helper(:)];

5 days ago | 0

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How to solve preallocating speed of a variable?
One simple solution is given here: https://www.mathworks.com/help/matlab/matlab_oop/creating-object-arrays.html "To preallocat...

5 days ago | 1

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Answered
Undefined function 'split' for input arguments of type 'char'
The function split was introduced in R2016b, so you will not be able to use it with R2013a. You can probably replace that line ...

5 days ago | 0

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Accessing data from a struct cell
Assuming that your structure is named S, you can loop over it like this: for k = 1:numel(S) plot(S(k).data) % default plot...

5 days ago | 0

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Convert cell array to vector
S = load('timestamps.mat'); T = vertcat(S.ans{:}) M = seconds(mean(diff(duration(T,'InputFormat','hh:mm:ss.SSS'))))

5 days ago | 0

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Create a Slanted Linspace Matrix
hankel(1:4,4:7)

5 days ago | 0

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Maximum number of repeated values over an array
a = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,9]; x = cumsum([true;diff(...

6 days ago | 1

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How to compare letters if they are same
Rather than building maps by hand, I would get Python to do the heavy lifting, e.g.: baz = @(v)char(v(1)); % only need the firs...

6 days ago | 0

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How to convert time stamp 11:21:17.155 into seconds in MATLAB??
The most efficient solution: a = '11:21:17.155'; b = [60*60,60,1]*sscanf(a,'%f:')

6 days ago | 0

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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...

7 days 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...

8 days 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...

10 days ago | 1

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Answered
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...

13 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 =...

13 days ago | 1

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