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 ...

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 years ago | 0

Answered

How to obtain hourly average from several years of data

G = groupsummary(struct2table(WSHelp),'DateTime','hour','mean');

How to obtain hourly average from several years of data

G = groupsummary(struct2table(WSHelp),'DateTime','hour','mean');

2 years 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 ...

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 years 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

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 years 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...

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 years ago | 0

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), ...

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 years 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...

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 years 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...

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 years 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 ...

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 ...

2 years ago | 0

| accepted

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 >>...

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 >>...

2 years 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' ...

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' ...

2 years 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...

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...

2 years 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:...

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:...

2 years ago | 0

Answered

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...

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...

2 years 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...

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...

2 years 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...

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...

2 years 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])

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])

2 years 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...

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...

2 years ago | 0

| accepted

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;...

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;...

2 years 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)]; % ...

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)]; % ...

2 years 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...

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...

2 years ago | 0

| accepted

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-...

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-...

2 years 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...

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...

2 years 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...

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...

2 years ago | 0

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Answered

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 ...

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 years 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...

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 years ago | 0

| accepted

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 ...

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 years ago | 0

| accepted

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 =...

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 years ago | 2

Answered

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...

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 years ago | 0

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Answered

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...

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 years ago | 0

| accepted