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Stephen


Active since 2014

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Answered
Normalize unit vector to single didgit integers
fun = @(V) round(V./10.^floor(log10(abs(V)))); fun([0.4,-0.4,0.8]) fun([0.123,0.123,0.5]) Note that this scales each element ...

ungefär 9 timmar ago | 0

Answered
How can I run this script and only create folders with files in it without having an additional file outside the folder?
Get rid of the FOPEN and FCLOSE, they are completely unrelated to WRITEMATRIX: start = tic; % input n and m n = input('\n How...

3 dagar ago | 1

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Answered
Why does .m4a audio file (imported via audioread) get stored in workspace with two data series/data columns instead of just one?
Clearly your audio file has two channels. The MATLAB documentation states that the first output is "... returned as an m-by-n ma...

5 dagar ago | 1

Answered
random selection from 5 different vectors
C = {[1;2;3;2],[4;5],[7;8;9],[0;1;2],linspace(0,1,101)}; V = {1,1,1,1,2}; F = @(v,n)v(randi(numel(v),1,n)); Z = cell2mat(cell...

5 dagar ago | 0

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Answered
Plotting numeric data vs time (from text file)
"I am trying to import some numeric data from a text file and then plot it in MATLAB." T = readmatrix('time.txt'); M = readmat...

5 dagar ago | 1

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Answered
Use a structure with fields in a loop - Outputs & indexing ??
Where S is your structure: F = @(a)a.Sig(1); V = arrayfun(F,S)

6 dagar ago | 0

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Answered
How to load multiple .mat files containing timetables into the workspace and concatenate them vertically
"Do I have to rename the structs..." No, you do not need to. But in future when designing data you should keep the structure n...

12 dagar ago | 0

Answered
Please help i seem to be failing to understand what the following errors mean and how to correct for them.
I suspect that something like this is what you are trying to do (I fixed many small bugs): g = 9.8; %gravit...

14 dagar ago | 0

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Answered
How to make the variable pace, a data type double
T = [0,33,3]; % the atheletes goal time [H,M,S] D = 10; % km P = required_pace1(T,D) class(P) P = required_pace2(T,D) % Usi...

15 dagar ago | 0

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Answered
Error using length, Too many input arguments.
if length(Obj.MatFile{cellnumber}{j}.(ExtractField))==2 But note that you do not need to check the length: taking the mean of o...

16 dagar ago | 1

Answered
Save output of a for loop in a vector
str = 'hello world. eat lots of bananas.'; target = zeros(150,1); for k = 4:numel(str) target(k) = isequal(str(k), str(k...

16 dagar ago | 0

Answered
Creating a new matrix and insert certain values into that matrix
I suspect that you are asking about SUB2IND: R = [1,3,3,2,2,3,3,4,3]; C = [1,1,1,3,4,1,2,1,4]; V = [2,2,2,4,2,3,3,2,1]; M = ...

18 dagar ago | 0

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Answered
Strings to variable names
Mixing up unrelated topics has made you think that this is much more complex than it really is. Look at your own code that you ...

20 dagar ago | 1

Answered
Random Number from a given vector of numbers
V = [-1,23,99,111,1024]; N = 3; A = V(randi(numel(V),1,N)) % with repetition B = V(randperm(numel(V),N)) % no repetition

21 dagar ago | 1

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Answered
How do I reformat a set of differently formatted dates in to one consistent format?
There is no tool which will correctly interpret the mutually-exclusive date formats used around the world: https://en.wikipedia...

23 dagar ago | 0

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Answered
Rewriting code without loops
Fake data: dev = rand(101,1); GradW = rand(4,101); HessW = rand(4,4,101); Your code: A = zeros(4,4,101); for i=1:101 ...

23 dagar ago | 0

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Answered
How to zero mean a 3-D array
The simple MATLAB approach: S = load('matlab.mat') A = S.A A = A - mean(A,2:3)

23 dagar ago | 0

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Answered
Won't show me my variable?
"What can I change to fix it?" Use logical indexing, e.g.: I = 0.5 * Ms; X = Ms>=3.5; I(X) = 21.29 * Ms(X) - 69.4; X = Ms>=...

23 dagar ago | 0

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Answered
Extract specific field names and associated data from a structure
Rather than using an IF it would be simpler to specify an appropriate filename for DIR: P = 'myfile'; S = dir(fullfile(P,'*bf_...

24 dagar ago | 0

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Answered
How can I extract the same variable from multiple files & concatenate them efficiently?
"I just can't seem to figure out how to efficiently extract a u and v vector from each file within the loop using my function be...

24 dagar ago | 0

Answered
Replace empty string with NaN in a cell
A = {"20","25","25",[],"20",[],"25","25","25","30"} A(cellfun(@isempty,A)) = {"NaN"} Using one string array is likely much bet...

24 dagar ago | 0

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Answered
copying specific elements of an array to another.
Forget about loops, the simple and efficient MATLAB approach is to use logical indexing: g = y(y>0.001)

26 dagar ago | 1

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Answered
how to shift rows to right and left of matrix ?
M = [1,2,3;4,5,6;7,8,9] A = [3,2,1]; B = [2,5,2]; c = [4,1,3]; for k = 1:size(M,1) if A(k)<B(k) %shift row to right wit...

26 dagar ago | 0

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Answered
How to create a pivot table from this table, Part 2
customer = {'Customer 1';'Customer 2';'Customer 3';'Customer 4'}; location = {'NY';'LA';'Austin';'LA'}; gender = {'male';'fe...

26 dagar ago | 0

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Answered
Doubt regarding max(A,B).
"Why is max(A,B) as [10 6 5]?" Because that syntax provides an element-wise comparison of the two input arrays, taking the maxi...

26 dagar ago | 3

Answered
changing the existing variables on the for loop
abc = [1,3,5,7]; k = abc; r = abc; for ii = 1:5 [r,k] = deal(k+3,r+5) end

27 dagar ago | 0

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Answered
how to use for loop for iterations in matrices?
"how to use for loop for iterations in matrices?" Do NOT number the variable names, unless you want to force yourself into writ...

27 dagar ago | 0

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Answered
Assigning an arbitrary number to an array
x = [2.32, 4.23, 1.92, 3.24, 2.13]; points = [3, 1, 2]; first_answer = x(points); [second_answer,idx] = min(first_answer); t...

27 dagar ago | 0

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Answered
Sort column vectors of a matrix and extract a new vector from a maximal criterion
M = [1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2; 1,1,1,1,2,2,2,2,4,4,4,1,1,1,2,2,2; 1,2,3,4,1,2,3,4,1,2,3,2,3,4,1,2,3; 31,16,15,9,10,8,13...

27 dagar ago | 0

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Answered
Assignment in a for loop
"Any suggestion how to solve this simple looking problem?" Use a non-scalar structure: https://www.mathworks.com/help/matlab/m...

28 dagar ago | 0

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