Stephen

Active since 2014

Suspensa Vix Via Fit

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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.
Faster: C = {'G07','G23','G04','G08','G20','G13','G30'}; V = sscanf(sprintf('%s',C{:}),'G%f')

6 hours ago | 0

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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...

8 hours ago | 0

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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(:))

12 hours 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...

15 hours ago | 0

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How to merge two tables, keeping independent variable (x) the same but summing the dependent variable (y)
Simpler: T1 = readtable('Confoss_landings.xls', 'VariableNamingRule','preserve') T2 = readtable('Mainefoss_landings.xls', 'Var...

18 hours ago | 0

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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))...

19 hours ago | 0

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Answered
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...

21 hours ago | 1

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

21 hours ago | 0

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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];...

1 day ago | 1

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Answered
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 ...

2 days ago | 1

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Answered
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))

3 days ago | 0

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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)

3 days ago | 0

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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...

4 days ago | 0

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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...

4 days ago | 1

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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 ...

6 days ago | 0

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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...

9 days 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...

11 days 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...

11 days 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...

11 days 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)

12 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...

18 days ago | 0

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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...

19 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...

20 days 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...

22 days ago | 1

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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...

22 days ago | 0

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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 = ...

23 days 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 ...

26 days ago | 1

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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

27 days ago | 1

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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...

29 days ago | 0

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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 ...

29 days ago | 0

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