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Stephen


Active since 2014

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Answered
How to store data when a string condition of another column is met?
T = readtable('SED_FULL_NE.xlsx') [G,YEAR,STATE_ABBR] = findgroups(year(T.BEGIN_DATE),T.STATE_ABBR); COUNT = accumarray(G,ones...

alrededor de 11 horas ago | 0

| accepted

Answered
find ( strcmp ( many_different_elements )
"But was wondering if there's a nicer way than to write 90 times in the find line" Of course: forget about repeated STRCMP call...

1 día ago | 0

Answered
Compare two Vectors and multiply equal entries
ID = 'ABCDEF'; val = 1:6; arr = 'AABBCDDDEFFE'; [X,Y] = ismember(arr,ID); out = val(Y(X))

3 días ago | 0

| accepted

Answered
Convert a cell array into arrays
Where C is your cell array: M = vertcat(C{:,4}) or M = cell2mat(C(:,4))

3 días ago | 1

| accepted

Answered
A function that counts the number of zeros in a vector
D = [1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1,0]; nnz(D==0)

3 días ago | 1

Answered
Get the position of the next in row and next in column in a matrix
A reasonably simple, efficient, robust approach: A = [1,0,-2,0,0;2,8,0,1,0;0,0,3,0,-2;0,-3,2,0,0;1,2,0,0,-4] [C,R] = find(A.')...

3 días ago | 1

Answered
How can I use a floating point number with input command?
L = 10; S = sprintf('Enter the location of the force (0 - %0.2f meters): ',L); a = input(S);

4 días ago | 0

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Answered
Plotting ode 45 results
clear all % <- get rid of this. It seems that the main purpose of CLEAR ALL is to introduce bugs into beginners' code when they...

7 días ago | 0

Answered
Removing a character from a table (that's within a struct)
As far as I understand, you want to convert one column/variable of the table from cell array of character vectors to numeric. Th...

8 días ago | 1

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Answered
How to save images on a new folder created automaticaly and named after a video.
"For example : mkdir vid.Path vid.Name. This should create a new folder named after the video`s name right ? " No it won't, bec...

9 días ago | 2

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Answered
How to use a function with array output for each value in a different array?
"Ideally, I would want a matrix with each day's zenith angles on each row of the matrix." That is easy, just make sure that DEL...

10 días ago | 0

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Answered
Compare 2 strings without using ismember or strcmp
Presuming that your examples with invalid syntax are actually supposed to be string arrays: a = ["qwert34776";"dnfien/8863";"fe...

19 días ago | 0

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Answered
Reducing number of elements.
V = rand(100,1) Z = mean(reshape(V,10,10),1).'

19 días ago | 0

Answered
How can I add n columns to a matrix?
A simpler, more versatile, and much more efficient approach is to use ZEROS: R = size(X,1); C = number_of_new_columns; X = [...

19 días ago | 1

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Answered
I want to increase my cell's length by 8 times, by making each and every element copying by 8 times.
C = {'cat','dog'}; D = repelem(C,8)

19 días ago | 0

| accepted

Answered
How to use interp1 command?
Numbering your variables like that is a red-herring that makes this task more complex. MATLAB is designed to work efficiently w...

19 días ago | 0

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Answered
I am attempting to change the value 'K' to a value of 10 so I can add it to other numbers.
Putting meta-data (e.g. the suits, card types) into variable names makes this task much harder. Meta-data is data and should be...

19 días ago | 1

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Answered
Dimensions of arrays being concatenated are not consistent.
The problem is the line-break without any ellipses. But your code can be simplified anyway, removing that problem: x = [ConcVal...

19 días ago | 0

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Answered
How to subtract coloumn vectors of a cell array
inp = load('mycell.mat').mycell; % input data fun = @(m) 1+diff(m,1,2); % anonymous function out = cellfun(fun,inp, 'uni',0) %...

20 días ago | 0

Answered
How to publish html in matlabcentral?
This can be done when you upload a submission to File Exchange (aka. FEX). You will need to: publish your M-file to HTML using ...

20 días ago | 0

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Answered
How to accumulate values ​​from time 1 to the last time
P = 'absolute or relative path to where the files are saved'; S = dir(fullfile(P, '*.txt')); % Select the file extension to su...

20 días ago | 0

Answered
Split a cell array of character vectors at multiple-number delimiter
Rather than telling us what you currently get, it is probably more useful if you tell us what you want. I made some guesses abo...

21 días ago | 1

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Answered
Reading mixed format data containing both text and numbers from a '.txt' file in matlab
fpt = '.'; % absolute or relative path to where the file is saved. fnm = fullfile(fpt,'text.txt'); % Count the header lines: ...

22 días ago | 1

Answered
Determining Order of flattening an array using colons
"If we use A(:,:) we expect an array with dimensions (X*Y, Z), with the i,j element pointing at (i mod X, i div Y, j) element o...

22 días ago | 1

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Answered
Saving file at different directory
You need to use FULLFILE to include the path in the filename, e.g.: [F,P] = uiputfile('FileNAME.txt'); fnm = fullfile(P,F); % ...

24 días ago | 1

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Answered
MATLAB plot is blank?
You are using matrix division where you should be using array division: https://www.mathworks.com/help/matlab/matlab_prog/array...

24 días ago | 0

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Answered
Get row number with certain data in it
"I tried the "find"-function but it didnt bring me to a useful result." It works for me: % Fake data: M = randi(9,7,2); M(5,...

24 días ago | 0

Answered
Add '_max' to odd variable names and '_min' to even ones.
T = array2table(rand(5,8),'VariableNames',{'Var1','t','Var3','ang_azi','Var5','vel_azi','Var7','acc_azi'}) T.Properties.Variabl...

24 días ago | 0

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Answered
How to I add zeroes onto a matrix?
Where V is your vector: V(end+1:52500) = 0

24 días ago | 1

Answered
I just need to get the numbers from this vector. The result must be a double. I need fast and clean code, as this operation is performed over and over again in my code.
Fastest: C = {'G07','G23','G04','G08','G20','G13','G30'}; V = sscanf(sprintf('%s',C{:}),'G%f')

24 días ago | 0

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