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Sindar


Last seen: 2 dagen ago

University of Colorado Boulder

215 total contributions since 2018

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Answered
How to store a matrix, A, in variable X, where X is also carrying a counter "i"
Simple way: add a third dimension, "pages": X(:,:,i) = A; But, if you only need the last iteration, it's better to store jus...

2 dagen ago | 0

Answered
Permutations of array retaining sub-array groups together
I believe the best way to describe your arrays-with-subgroups is using cell arrays: my_array = {1 [2 3] 4} my_array = {...

5 dagen ago | 0

Answered
Does MATLAB have functionality similar to Mathematica's Import function to import html tables?
check out htmlTableToCell on the file exchange, followed by cell2table

5 dagen ago | 0

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Answered
Random shuffle of image pixels/ Image scrambling
You can use randperm to shuffle the indices randomly, then sort to get the indices for reversing it: % load in an image include...

9 dagen ago | 0

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Nested loops and function output into a matrix inconsistency
It seems like your 'w' columns are supposed to correspond to q-r pairs. Currently, this isn't happening, so each q-r pair will f...

9 dagen ago | 0

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Answered
How to write special characters into an Excel cell?
If you can find the numeric code for the symbols, it should print with that. For example, this prints π | ϕ | μmol/kg T1.Proper...

30 dagen ago | 0

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Answered
Adding a unit row to a table
% create example table T = array2table(magic(3),"VariableNames",["a";"b";"c"]); % define units T.Properties.VariableUnits = [...

ongeveer een maand ago | 0

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Answered
Changing empty array for peak width to zero
% preallocate default values pks1 = nan(25,1); loc1 = nan(25,1); width1 = zeros(25,1); prom1 = nan(25,1); for i=1:25 [...

ongeveer een maand ago | 0

Answered
How to select matrix column from minimum row value
distance_to_point = [2, 3, 4, 5; 6.8, 2.9, 6.1, 6.7] [~,idx] = min(distance_to_point(2,:)); new_point = distance_to_point(:,id...

ongeveer een maand ago | 0

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Answered
Aquire random sampling of plot values
Assuming your two datasets share x values and are not absurdly massive, this direct method is probably faster % generate some s...

ongeveer 2 maanden ago | 0

Answered
How is parfor time taken is larger than that by normal for loop ?
Best guess: you don't preallocate y, nor clear it. So, the parfor needs to expand the vector constantly while the for is simply ...

2 maanden ago | 0

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How to obtain hourly average from several years of data
G = groupsummary(struct2table(WSHelp),'DateTime','hour','mean');

2 maanden ago | 0

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Answered
how to split these char format into lines
ed: Matlab has a built-in function w_split = splitlines(w); Here's a trick: I don't know what the delimiter between lines ...

2 maanden ago | 0

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Answered
Adding fields and values to a structure iteratively
n=3; priors=struct(); for ind=1:n priors.("prior"+ind) = makedist('uniform',-1,1); end

2 maanden ago | 0

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Answered
How to copy data from multiple .mat files into single .mat file?
Assuming absolutely nothing about your data, this should dump the saved data into a single matfile (one variable per loaded file...

2 maanden ago | 0

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How to create multiple plots for time series data?
While you may want to think about a cleaner way of dealing with the plot (e.g., plotting in the same figure window and saving), ...

2 maanden ago | 0

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Answered
Finite difference scheme used in 'CURL' function?
You can actually see the full code using edit curl it looks like everything is based on gradient, which appears to use a 2-poi...

2 maanden ago | 0

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Need help writing code to attach date (1-365) from 30 years of data to the actual data needed to be processed. Trying to group into months.
edit: final code for this case: "What I am working with is a 842,382x3 matrix where the first column is a repetition of numbers...

2 maanden ago | 0

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Answered
Using randsample on a matrix of weights
it doesn't seem like the assignment statement has any reason to be in the loop. Pulling it out may save a decent amount of time ...

3 maanden ago | 0

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Answered
Multiply local values of a matrix with a vector
I'm not quite clear on which columns you want to change, but take a look at this and see if it makes sense: % sample matrix >>...

3 maanden ago | 0

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Answered
Convert several columns char matrix into one column char matrix
join? >> tmp={'a' 'b' 'c' ; 'd' 'e' 'f'} tmp = 2×3 cell 'a' 'b' 'c' 'd' 'e' ...

3 maanden ago | 0

Answered
How to make a structure to be input of a function and then its updated version to be output of the function?
function new_struct = update_struct(old_struct,add_field, add_val) new_struct = old_struct; new_struct.(add_field) = a...

3 maanden ago | 0

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Answered
are there GPU settings in matlab?
Most code will not be run on the GPU without adjustment There are guides here and it looks pretty easy for many applications:...

3 maanden ago | 0

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how can i solve this error?and how can i get wavelet toolbox ?
Check here whether you have a license for it, or need to buy: https://www.mathworks.com/products/wavelet.html?s_tid=srchtitle#tr...

3 maanden ago | 0

Answered
how to choose a random excel cell in a certain coloum
If you have R2019a or above, use readmatrix. But, the issue is that you are mixing up passing a variable and a string. It happ...

3 maanden ago | 0

Answered
Save data to Excel without overlapping
Check out writematrix: https://www.mathworks.com/help/matlab/ref/writematrix.html#mw_f36f6f84-e6bd-4749-8957-a88b07036116 Somet...

3 maanden ago | 0

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Answered
how to make label y axis specific?
% if you want a label at 0, make sure to include it in your limits ylim([0 1000]) yticks([0 500 1000])

3 maanden ago | 0

Answered
Converting nested "summary" structure to table
Here's the loop version. There may be another way, but I didn't have any luck fighting with Matlab's tricky multiple-cell return...

3 maanden ago | 0

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Answered
How to find the non-zero minimum of a subset of matrix elements
The issue is that logical indexing doesn't work when you are checking against a subset of the matrix: >> A = [1 2 3 4; 2 0 1 5;...

3 maanden ago | 0

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Answered
Changing the number of xticks on heatmat (without changing the data)
Try: xt=xticks; xticks(xt(1:10:end)) If that doesn't work, it sounds like ax = gca; ax.XDisplayData = [date(1:10:end)]; % ...

3 maanden ago | 1

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