Stephen23

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reshape 4-dimension array
https://www.mathworks.com/help/matlab/ref/double.permute.html https://www.mathworks.com/help/matlab/ref/double.reshape.html A ...

7 hours 前 | 0

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Can someone explain why the top code works but the bottom one has an error that says "Index exceeds the number of array elements. Index must not exceed 1."
"Can someone explain why the top code works but the bottom one has an error that says "Index exceeds the number of array element...

1 day 前 | 0

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已回答
MATLAB Indexing type dependence (bug?)
"what does it matter to the indexing whether it is a single or a double?" Because single precision cannot represent all of thos...

1 day 前 | 0

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Avoid negative sign with compose() when output is zero, e.g. '-0' or '-0.0'
num = -0.04; txt = compose('%.1f', num) txt = regexprep(txt,'^-(0+(\.0+)?)$','$1')

1 day 前 | 0

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Why do my plots overlap instead of showing up side-by-side?
Explanation: TILEDLAYOUT was written assuming one axes in each tile position. When you create a 2nd (or more) axes in a specific...

2 days 前 | 0

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Separate data series based on parameter within the data.
A = [1,12,13,14; 1,21,23,24; 2,32,33,34; 100,42,43,44] [G,ID] = findgroups(A(:,1)); Method one: F = @(x)A(x==A(:,1),:); C = ...

3 days 前 | 0

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The surface area won't round to one decimal place and I don't know how to get rid of the 'e's.
https://www.mathworks.com/help/matlab/ref/format.html Do not mix up the data stored in memory with how those data are displayed...

5 days 前 | 1

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LaTeX interpreter with multiple strings or character vectors
Without even reading the XTICKLABELS documentation lets first do some basic reasoning: is a single character vector. XTICKLABEL...

6 days 前 | 0

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Fast reorganization of cell arrays
The timings might be similar for small arrays, but try testing on larger arrays! tic % Initialize target and source arrays tg...

7 days 前 | 0

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已回答
Left Justifying a String obtained from the formattedDisplayText() function
You would have to delete all leading space that occurs after any newline characters, e.g.: str = regexprep(str,'^[ \t]+','', 'l...

9 days 前 | 0

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Sort array based on particular rows
format long G M = load('matlab.mat').out X = -fix(2*(0:size(M,1)-1)/11); [~,Y] = sortrows([X(:),M],'descend'); Z = M(Y,:)

9 days 前 | 0

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Extract data using variable names
https://www.mathworks.com/matlabcentral/discussions/tips/849901-tutorial-why-variables-should-not-be-named-dynamically-eval The...

10 days 前 | 1

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Calculations involving indexed variables and creating data tables
Lets first create some fake data (because you did not upload any sample data): T = array2table(rand(7,4),'VariableNames',{'X','...

10 days 前 | 0

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vpa does not work with the desired amount of digits
You need to set the digits first: https://www.mathworks.com/help/symbolic/digits.html The default is 32. "returns an answer w...

10 days 前 | 3

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Alligning the output using fprintf
I = [0.0039,0.0038,0.2,0.402,0.628,0.837,1.069,1.234,1.436,1.666,1.79,2.05,1.8,1.54,1.42,1.24,1.03,0.8,0.61,0.4,0.18,0,-0.19,-0....

10 days 前 | 0

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xlsread multiple files from multiple folders
S = dir('Y:\Projects\*\*.xls'); W = 'Logic'; for k = 1:numel(S) F = fullfile(S(k).folder,S(k).name); [num,str] = xls...

11 days 前 | 0

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Convert a cell containing structs into a single Struct
Avoid evil EVAL(). Constructing text that looks like code and then evaluating it should definitely be avoided. Using comma-sepa...

15 days 前 | 1

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how to load and read sparse matrix from txt file to MATLAB ?
N = {}; C = {}; F = fopen('Ksparse.txt','rt'); while ~feof(F) N{end+1} = strtrim(fscanf(F,'%[^[]')); C{end+1} = spc...

15 days 前 | 1

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vector conversion from a vector of numbers to a vector cell of chars.
Y = [0,4,6]; X = cellstr(string(Y)) X = arrayfun(@num2str,Y,'uni',0) X = compose('%u',Y(:)).' X = split(num2str(Y)).' X = n...

18 days 前 | 1

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Matlab spdiags function not do what I expect
"Why is C so different from the previous two?" Look at your code! On this line you completely overwite B with a completely diff...

19 days 前 | 0

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Hi everybody. I'm kind of new to MATLAb and looking to get more efficient in my coding. This feels clunky to me and I feel like I could definitely shorten it. Any ideas?
Vectorize your code: https://www.mathworks.com/help/matlab/matlab_prog/vectorization.html Engine = ["LO2/LH2";"LO2/CH4";"ST...

22 days 前 | 0

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How do I print one value on one row and another on the next
Taking a wild guess: fmt = '%s %10.8f %10.8f %10.8f\r\n'; for i = 1:2:size(unit,1) fprintf(fid_1, fmt,'B',unit(i+0,1:3));...

23 days 前 | 0

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Create multiple subtables from multiple .tsv tables
"The following code does it only for the first .tsv file. Any hint to go recursively over the 120 .tsv files? " There is nothin...

23 days 前 | 0

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How to import multiple .mat files into the same workspace
"The problem is that the content of the most recent .mat file overwrites the previous one since the name of the arrays is always...

28 days 前 | 1

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Run for loop 1000 times and get distribution of results
T = 1; N = 2^8; dt = 1/N; r = 1; G = 0.7; e = 0.5; R = 2; Dt = R*dt; L = N/R; M = 1000; Xem = nan(M,L); for...

1 month 前 | 0

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define an objective function with user defined number of variables in fminunc()
"How do I define the objective function fun() such that it automatically adapts to the number of variables." fun = @(x) sum(x.^...

1 month 前 | 0

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Trying to create a drop down that will open a new uifigure, nothing happens when I click confirm?
Simpler solution: get rid of dda.ItemsData. Then .Value is exactly the text that is shown in the menu. This is explained here: ...

2 months 前 | 1

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how to read the data of type a*b?
str = '1*5 5*4 6 8 3 12 -5 9*0 7*-1'; vec = sscanf(str,'%f%*[ *]',[1,Inf])

2 months 前 | 0

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Error when creating a tensor from a for loop
"Can anyone tell me what is causing this problem?" Explanation Look at the values that you are using as indices. For the 1st c...

2 months 前 | 0

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I want to build the matrix
m = 4; n = 3; A = randi(9,n) C = [{zeros(n),eye(n)},arrayfun(@(p)A^p,1:m-1,'uni',0)]; G = cell2mat(C(1+tril(toeplitz(1:m))...

2 months 前 | 0

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Stephen23

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