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Sindar


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University of Colorado Boulder

200 total contributions since 2018

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Answered
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 days 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...

4 days ago | 0

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Answered
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...

4 days 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 ...

5 days 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 >>...

5 days 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' ...

6 days 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...

7 days 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:...

13 days 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...

13 days 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...

13 days 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...

13 days 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])

15 days ago | 0

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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...

16 days 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;...

16 days 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)]; % ...

16 days ago | 1

Answered
Extract row data from a table as a result of intervals (boundaries) being called in from a different structure
Does this do it? % generate some random data 0-1 DATA = rand(328,338); % set the lower and upper bounds to extract as 0.25 an...

24 days ago | 0

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Answered
Discrete fourier transform (DFT) Question
Check out this example from the angle documentation: https://www.mathworks.com/help/matlab/ref/angle.html#mw_9b727746-7db3-4b26-...

24 days ago | 0

Answered
how to load a matfile and access & process its content.
% create a structure with field 'somefield' containing the desired filename mystruct = struct('somefield','execution') % creat...

25 days ago | 1

Answered
Deleting/selecting and subsetting specific slices in a multi-dimensional array
This may not be the most efficient way, but you can take that 2D logical array and rebuild your 3D logical array: subset_3D = a...

1 month ago | 0

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what is the physical meaning of getting peak of higher amplitude in frequency domain by using FFT??
Assuming you kept track of normalization correctly(*), yes, a higher amplitude of the fft corresponds to higher signal strength ...

2 months ago | 0

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Answered
Can matlab work with NVIDIA 2gb Graphics card?
It depends on what you're trying to do, but I would think you should be fine. I worked for years on a 8 GB RAM / 1 GB GPU machin...

2 months ago | 0

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Answered
Does FFT output vary if I split a signal into windowed time segments instead of using a Hanning Window?
A few things to consider: more time-domain elements --> finer frequency domain spacing. treating the three cuts the same will ...

2 months ago | 0

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Answered
Placing a structure within a map container - or is there a different, more suitable way to store this type of data?
You can give tables row names so they are indexible that way: keys = {'Jan','Feb','Mar'}; n_keys = length(keys); data_table =...

2 months ago | 2

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Matlab Tasks from proffesor
First one: define symbolic variables write out the expression in linear math notation ask Matlab to rewrite the equation as s...

2 months ago | 0

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Reading a N columns table which sometimes have N+1 columns
Assuming you don't need the '**' info, you could try this solution from the fscanf examples which skips the remainder of the lin...

2 months ago | 0

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Answered
1. For x from 1 to 100, calculate y. Use fopen and fprintf to write x and y data into a file named “my_data.txt”. Then use fopen and fscanf to read the data. Show the data in two columns. Function to be used: y = e^(0.02x)
Please don't post homework problems without showing your attempts and asking specific questions. I'm feeling generous, though, s...

2 months ago | 0

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Answered
MATLAB Answers Wish-list #5 (and bug reports)
Add a set of pre-written comments for common situations. Things like: "this is clearly a homework problem, please display some ...

2 months ago | 4

Answered
Monthly Average from Daily Data
See findgroups for taking the mean based on a grouping variable. See month for converting a datetime variable to its month See...

2 months ago | 0

Answered
How to vectorize this code?
frequency=randi([0 578],110,1); axis=[-275:5:270]'; % get indices where axis is negative axis_negative = (axis<=0); % calcul...

2 months ago | 0

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Answered
how to use for loop to compute a matrix
Assuming each one produces a 25 x 12852 dist array, you can do this fairly easily. Which dimension do you want to concatenate on...

2 months ago | 0

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