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Sindar


Last seen: 2 days ago

University of Colorado Boulder

218 total contributions since 2018

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  • Introduction to MATLAB Master
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Answered
While starting Matlab icon on desktop, it is throwing error matlab.exe is moved or deleted.
delete the Matlab icon on your desktop type "Matlab" into your Start Menu search The top result should be the Matlab app/progr...

2 days ago | 0

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Plot bar chart with log scale on y axis with different base
% set whatever base you want (incl. decimals) mybase = 2; % get current limits yl = ylim(); % convert to log-mybase scale y...

2 days ago | 0

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What frustrates you about MATLAB? #2
Livescript complaints First off, they've come a long way since I tried them on release. But, there are still some issues: Drop...

3 days ago | 1

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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...

7 days ago | 0

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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 = {...

10 days ago | 1

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

10 days ago | 0

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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...

13 days 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...

13 days ago | 0

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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...

1 month ago | 0

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

1 month 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 [...

1 month ago | 0

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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...

1 month ago | 0

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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...

2 months ago | 0

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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 months ago | 0

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

2 months ago | 0

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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 months ago | 0

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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 months ago | 0

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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 months 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), ...

3 months ago | 0

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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...

3 months 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...

3 months 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 months ago | 0

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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 months ago | 0

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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 months ago | 0

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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 months ago | 0

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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 months 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 months ago | 0

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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 months ago | 0

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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 months 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 months ago | 0

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