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using a value to find index in a matrix?

The simplest solution is to simply check for equality: idx = x==Matrix_A; which will return a logical array with true in every...

using a value to find index in a matrix?

The simplest solution is to simply check for equality: idx = x==Matrix_A; which will return a logical array with true in every...

4 hours ago | 0

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Extract unknown number of vectors from matrix

" num2cell would create separated cells with the n vectors of size, but sub2ind also does not run on cells." True, but you can ...

Extract unknown number of vectors from matrix

" num2cell would create separated cells with the n vectors of size, but sub2ind also does not run on cells." True, but you can ...

6 hours ago | 0

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Answered

code to load my files from folder, add workspace variable and save to another folder

You don't need to load the file data, you can use save's '-append' option: fs = 128; for ... loop over all files, you need to ...

code to load my files from folder, add workspace variable and save to another folder

You don't need to load the file data, you can use save's '-append' option: fs = 128; for ... loop over all files, you need to ...

7 hours ago | 1

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Answered

exceeded number of array elements

Ru is scalar, but in multiple locations you try to access Ru(2), e.g.: for u = 1:2 xX{u} = @(Beta) Ru(u)*cos(Beta) + sqrt( R^2...

exceeded number of array elements

Ru is scalar, but in multiple locations you try to access Ru(2), e.g.: for u = 1:2 xX{u} = @(Beta) Ru(u)*cos(Beta) + sqrt( R^2...

8 hours ago | 1

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How to replace every non-0 number with the number in that place added to another number - no loops

I think it is neater to only define the index once: >> X = A~=0; >> A(X) = A(X)+B A = -6 0 -4 -3 -2 0 1 0 ...

How to replace every non-0 number with the number in that place added to another number - no loops

I think it is neater to only define the index once: >> X = A~=0; >> A(X) = A(X)+B A = -6 0 -4 -3 -2 0 1 0 ...

11 hours ago | 0

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Error "too many output argument" in function

"How should I do to fix the error?" If you want a function to return an output then the it must be defined in the function decl...

Error "too many output argument" in function

"How should I do to fix the error?" If you want a function to return an output then the it must be defined in the function decl...

11 hours ago | 0

Answered

pass string variable to a function in uicontrol callback

Define the function to accept five input arguments: function correctAnswer(hCorrectAns,EventData,num1,randomVector,string1) an...

pass string variable to a function in uicontrol callback

Define the function to accept five input arguments: function correctAnswer(hCorrectAns,EventData,num1,randomVector,string1) an...

15 hours ago | 0

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how do i plot til some x one function and then other

x = 0:0.1:20; y = min(12,x); plot(x,y,'-+') In a more general case, use logical indexing, e.g.: x = 0:0.1:20; y = x; y(y...

how do i plot til some x one function and then other

x = 0:0.1:20; y = min(12,x); plot(x,y,'-+') In a more general case, use logical indexing, e.g.: x = 0:0.1:20; y = x; y(y...

17 hours ago | 1

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Answered

Index exceeds the number of array elements (1).

Your define angulo as a scalar (i.e. size 1x1): angulo= 15; and then a few lines later with i=2 you try to access its 2nd elem...

Index exceeds the number of array elements (1).

Your define angulo as a scalar (i.e. size 1x1): angulo= 15; and then a few lines later with i=2 you try to access its 2nd elem...

18 hours ago | 0

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Answered

Inputting the function Sin(2x)Cos^2(0.5x)

x = linspace(0,2*pi,50); y = sin(2*x).*cos(0.5*x).^2; plot(x,y)

Inputting the function Sin(2x)Cos^2(0.5x)

x = linspace(0,2*pi,50); y = sin(2*x).*cos(0.5*x).^2; plot(x,y)

1 day ago | 0

Answered

Plot a variable within a function

"How should I plot Ca vs W curve after function has been evaluated" Return the required variables as the 2nd, 3rd, etc. functio...

Plot a variable within a function

"How should I plot Ca vs W curve after function has been evaluated" Return the required variables as the 2nd, 3rd, etc. functio...

1 day ago | 0

Answered

Invalid data type - converting to cell array to run functions

In both cases your code nests a cell array inside a cell array: dff{i} = num2cell(tot_dff(1,f_i(i):f_o(i))); % ^^^^^^...

Invalid data type - converting to cell array to run functions

In both cases your code nests a cell array inside a cell array: dff{i} = num2cell(tot_dff(1,f_i(i):f_o(i))); % ^^^^^^...

1 day ago | 1

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Answered

Using an integral in a function

The problem is that in the "main file" you did not declare q_Max and f_1 as global. But rather than using global variables (whi...

Using an integral in a function

The problem is that in the "main file" you did not declare q_Max and f_1 as global. But rather than using global variables (whi...

1 day ago | 0

Answered

Doubt about plotting in Matlab and finding intersect points

"...if I plot the circle with the lines, the circle deforms to an oval" axis('equal') https://www.mathworks.com/help/matlab/re...

Doubt about plotting in Matlab and finding intersect points

"...if I plot the circle with the lines, the circle deforms to an oval" axis('equal') https://www.mathworks.com/help/matlab/re...

1 day ago | 0

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Answered

I am trying to write a recursive code to check whether a string is palindrome or not, when i am running a trial case a error message shows up stating "he function call palindrome('madam') caused an error and did not complete (MATLAB:TooManyOutputs)".

If you want to return an output argument then it must be declared in the function, e.g.: function out = palindrome(v) if l...

I am trying to write a recursive code to check whether a string is palindrome or not, when i am running a trial case a error message shows up stating "he function call palindrome('madam') caused an error and did not complete (MATLAB:TooManyOutputs)".

If you want to return an output argument then it must be declared in the function, e.g.: function out = palindrome(v) if l...

2 days ago | 0

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how to load saved workspace in a custom named variable?

The efficient approach is to use indexing (rather than anti-pattern dynamic variable names): https://www.mathworks.com/help/mat...

how to load saved workspace in a custom named variable?

The efficient approach is to use indexing (rather than anti-pattern dynamic variable names): https://www.mathworks.com/help/mat...

2 days ago | 1

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Answered

converting abbreviation of months to numerical value

ismember makes this easy: >> D = {'mar','apr','nov','may'}; % your data >> C = {'jan','feb','mar','apr','may','jun','jul','aug...

converting abbreviation of months to numerical value

ismember makes this easy: >> D = {'mar','apr','nov','may'}; % your data >> C = {'jan','feb','mar','apr','may','jun','jul','aug...

2 days ago | 0

Answered

how do I create a loop for to extract doubles variables from a cell array?

Where raster_data is your cell array: for k = 1:numel(filenames) raster_labels = raster_data{k}; ... the rest of your...

how do I create a loop for to extract doubles variables from a cell array?

Where raster_data is your cell array: for k = 1:numel(filenames) raster_labels = raster_data{k}; ... the rest of your...

2 days ago | 0

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Answered

Extracting data from a table that has cells in cells

>> S(1).date = '20200120'; >> S(2).date = '20200120'; >> S(1).id = 1; >> S(2).id = 2; >> S(1).action = [0;0;0;1;0]; >> S(2)...

Extracting data from a table that has cells in cells

>> S(1).date = '20200120'; >> S(2).date = '20200120'; >> S(1).id = 1; >> S(2).id = 2; >> S(1).action = [0;0;0;1;0]; >> S(2)...

2 days ago | 1

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Answered

Split array of sensor data by indexing

S = load('matlab.mat'); T = S.Data.IMU; G = findgroups(T.name); C = arrayfun(@(g)T(g==G,:),1:max(G),'uni',0); You can then t...

Split array of sensor data by indexing

S = load('matlab.mat'); T = S.Data.IMU; G = findgroups(T.name); C = arrayfun(@(g)T(g==G,:),1:max(G),'uni',0); You can then t...

2 days ago | 1

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Answered

What code is it?

"Is there someone recognize the following code..." It isn't code, it is a binary .mat file (just as the text at the start of th...

What code is it?

"Is there someone recognize the following code..." It isn't code, it is a binary .mat file (just as the text at the start of th...

3 days ago | 0

Answered

store for loop outcomes in matrix

With MATLAB it is generally much better to loop over indices (rather than over data values), then you can simply use those indic...

store for loop outcomes in matrix

With MATLAB it is generally much better to loop over indices (rather than over data values), then you can simply use those indic...

3 days ago | 0

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Answered

Importing and Organizing Text File Data

This efficiently reads all of the file data into one structure. [fid,msg] = fopen('Example_File.txt','rt'); assert(fid>=3,msg...

Importing and Organizing Text File Data

This efficiently reads all of the file data into one structure. [fid,msg] = fopen('Example_File.txt','rt'); assert(fid>=3,msg...

3 days ago | 0

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Answered

Variable 'KD' is not fully defined on some execution paths

Look at this line of code KD_anterior=KD; and now consider what is the value of KD the second time the function is called. The...

Variable 'KD' is not fully defined on some execution paths

Look at this line of code KD_anterior=KD; and now consider what is the value of KD the second time the function is called. The...

3 days ago | 0

Answered

How to select or group sections of an array without using indexing

>> A = [NaN, NaN, NaN, NaN, 2, 3, 6, 7, NaN, NaN, NaN, NaN, NaN, 4, 6, 8, 8, NaN, NaN, NaN, NaN]; >> X = diff([true,isnan(A),tr...

How to select or group sections of an array without using indexing

>> A = [NaN, NaN, NaN, NaN, 2, 3, 6, 7, NaN, NaN, NaN, NaN, NaN, 4, 6, 8, 8, NaN, NaN, NaN, NaN]; >> X = diff([true,isnan(A),tr...

3 days ago | 0

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Answered

Assign values of .mat files into matrix

D = 'path to the folder where the files are saved'; S = dir(fullfile(D,'silomodresults*.mat')); C = {}; for k = 1:numel(S) ...

Assign values of .mat files into matrix

D = 'path to the folder where the files are saved'; S = dir(fullfile(D,'silomodresults*.mat')); C = {}; for k = 1:numel(S) ...

3 days ago | 0

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Answered

Splitting an array up

Just use mat2cell, no need for reshape: >> M = rand(64,92690); % fake data >> N = 2048; >> S = size(M); >> V = repmat(N,1,fi...

Splitting an array up

Just use mat2cell, no need for reshape: >> M = rand(64,92690); % fake data >> N = 2048; >> S = size(M); >> V = repmat(N,1,fi...

3 days ago | 2

Answered

Subtraction inside a cell array

You will have to get the numeric data out of the cell array before performing any numeric operations on it. Although you did no...

Subtraction inside a cell array

You will have to get the numeric data out of the cell array before performing any numeric operations on it. Although you did no...

4 days ago | 0

Answered

How to combine the multiple .mat files of ecg to get a single file.

This should get you started: D = 'path to the folder where the files are saved'; S = dir(fullfile(D,'*.mat')); for k = 1:nume...

How to combine the multiple .mat files of ecg to get a single file.

This should get you started: D = 'path to the folder where the files are saved'; S = dir(fullfile(D,'*.mat')); for k = 1:nume...

4 days ago | 1

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