Community Profile # Stephen

Active since 2014

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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); % ...

11 hours ago | 0

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...

14 hours ago | 0

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,...

17 hours ago | 0

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...

17 hours ago | 0

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

19 hours ago | 1

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')

1 day ago | 0

How do you capitalize the first and the third letter of each word in a sentence?
T = 'my pet is hungry'; U = regexprep(T,'(?<=\<(\w{2})?)(\w)','\${upper(\$1)}') Of course because this is clearly homework you w...

1 day ago | 0

I need a function to identify if a number is part of a vector or matrix.
Where M is your matrix and N is your scalar number: any(N==M(:))

1 day ago | 1

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change the first digits when ends with 5959
Rather than messing around with strings you should probably just work with duration objects or numeric arrays. S = ["000000";"0...

1 day ago | 0

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How to merge two tables, keeping independent variable (x) the same but summing the dependent variable (y)

1 day ago | 0

Interpolate/Resample to a specific decimal point
Assuming no adjacent duplicate values: S = 1; V = [1,3,4,7,6,3,6]; X = cumsum([1,abs(diff(V))]); Z = interp1(X,V,1:S:X(end))...

1 day ago | 0

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How to combine 2 tables with different variables into 1 table?
The actual MATLAB solution just takes one simple line of code: SysTime = [1;2;3;4;5]; EDF = [10;20;30;40;50]; T1 = table(SysT...

2 days ago | 1

How to properly format a data table with fprintf?
A = [1,2,3,4,5]; fprintf('Numbers%s\n',sprintf(' %1.2f',A))

2 days ago | 0

Why the results of the matrix X' dont show?
Use https://www.mathworks.com/help/matlab/ref/mldivide.html A = [0,2,-1,0;0,0,1,-1;1,-1,0,0;-1,0,0,1]; B = [100;-500;300;100];...

2 days ago | 1

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Create Multiple Arrays While Looping Through One Single Array
By far the simplest and most efficient solution is to use one matrix: V = 1:81 M = reshape(V,9,9).' You can trivially access ...

3 days ago | 1

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how to add elements to an array in a for loop
The MATLAB approach is to use logical indexing, not a loop: V = [2,4,5,6,3]; N = sum(V(V>=5))

4 days ago | 0

I am unable to display my answers on command window
https://www.mathworks.com/help/matlab/ref/display.html a = [3 6 1 9; 6 5 3 7; 7 3 2 6]; display(a)

4 days ago | 0

Convert MAT file to v7.3
You can load and save the individual (or any selected) variables using the structure approach too. Lets try it: A = 1:3; B = 4...

5 days ago | 0

linspace not working on MATLAB Coder
In MATLAB it is usually better to loop over indices. Perhaps this would work: V = linspace(-r_max*Tc_usbl,r_max*Tc_usbl,decisio...

5 days ago | 1

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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 ...

7 days ago | 0

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...

10 days ago | 1

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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...

12 days ago | 1

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...

12 days ago | 0

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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...

12 days ago | 1

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

13 days ago | 0

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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...

19 days ago | 0

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...

20 days ago | 0

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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...

21 days ago | 0

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