Answered

Create a row vector comparing strings in a for loop

index = []; s1 = { 'FMO1','FMO2','FMO3','FMO4', 'BAO1', 'BAO2', 'BAO3', 'BAO4'}; s2 = {'mean','FMO1','BAO4','FMO2'}; for k =...

Create a row vector comparing strings in a for loop

index = []; s1 = { 'FMO1','FMO2','FMO3','FMO4', 'BAO1', 'BAO2', 'BAO3', 'BAO4'}; s2 = {'mean','FMO1','BAO4','FMO2'}; for k =...

1 year ago | 0

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Answered

Plot u=f(x,y,z) with all discrete data

x = rand(1,100); y = rand(1,100); z = rand(1,100); u = rand(1,100); scatter3(x,y,z,20,u,'filled') colorbar

Plot u=f(x,y,z) with all discrete data

x = rand(1,100); y = rand(1,100); z = rand(1,100); u = rand(1,100); scatter3(x,y,z,20,u,'filled') colorbar

1 year ago | 0

Answered

How can i delete max values for each 5 rows in vector

The following code will apply to any lenght of A and any length N of window from which to delete the maximum, provided that leng...

How can i delete max values for each 5 rows in vector

The following code will apply to any lenght of A and any length N of window from which to delete the maximum, provided that leng...

1 year ago | 0

Answered

Why the out varies largely in fixed versus variable time step?

That is because the fixed time step is not able to resolve the very steep change in the variable value that is clearly shown in ...

Why the out varies largely in fixed versus variable time step?

That is because the fixed time step is not able to resolve the very steep change in the variable value that is clearly shown in ...

1 year ago | 0

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Answered

Find elements having a specific row and column numbers in a matrix

If the answer is the diagonal, then I'd use the diag function. However, if you are still interested in generalizing the code, y...

Find elements having a specific row and column numbers in a matrix

If the answer is the diagonal, then I'd use the diag function. However, if you are still interested in generalizing the code, y...

1 year ago | 0

Answered

How can we plot different signals S1 S2 and S3 on same y-axis with different values? I have attached a figure for reference.

Assume you have three signals which may overlap when plotted like so x = linspace(154,157,100); s1 = rand(1,100); s2 = rand(...

How can we plot different signals S1 S2 and S3 on same y-axis with different values? I have attached a figure for reference.

Assume you have three signals which may overlap when plotted like so x = linspace(154,157,100); s1 = rand(1,100); s2 = rand(...

1 year ago | 0

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Answered

A table of s versus t.

There are a couple of errors in your code. First, the way you define the array t. Second, for array operations, use the dot no...

A table of s versus t.

There are a couple of errors in your code. First, the way you define the array t. Second, for array operations, use the dot no...

1 year ago | 0

Answered

A compact way to (i) sum two rows and two columns and then (ii) remove one of the two summed rows and one of the two summed columns

Your way is already quite compact. Maybe what you want to avoid is having to concatenate. Then, you could try this. x1 = [1 0 ...

A compact way to (i) sum two rows and two columns and then (ii) remove one of the two summed rows and one of the two summed columns

Your way is already quite compact. Maybe what you want to avoid is having to concatenate. Then, you could try this. x1 = [1 0 ...

1 year ago | 0

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Answered

How to form a matrix based on the order of input

Input= [110 101 011 111 100 001 010]; M = Input == sort(Input)'

How to form a matrix based on the order of input

Input= [110 101 011 111 100 001 010]; M = Input == sort(Input)'

1 year ago | 1

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Answered

function handle as array

That's because mtimes(a,b) = a*b, and if a is 4x4 and b is 4x1 than the operation yields a 4x1 array. I think what you might wa...

function handle as array

That's because mtimes(a,b) = a*b, and if a is 4x4 and b is 4x1 than the operation yields a 4x1 array. I think what you might wa...

1 year ago | 0

Answered

Identify the duration of zero values and count the number of such zero regions

Use regionprops time = 0:100; signal = rand(size(time)); signal([3:6,15:21,43:55,61:64,87:92]) = 0; plot(time,signal) r = r...

Identify the duration of zero values and count the number of such zero regions

Use regionprops time = 0:100; signal = rand(size(time)); signal([3:6,15:21,43:55,61:64,87:92]) = 0; plot(time,signal) r = r...

1 year ago | 0

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Answered

How to count number of ones and zeros in a binary number?

I will assume that your binary numbers are stored as a character array, which is how Matlab normally works, e.g. A = dec2bin(20...

How to count number of ones and zeros in a binary number?

I will assume that your binary numbers are stored as a character array, which is how Matlab normally works, e.g. A = dec2bin(20...

1 year ago | 1

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Answered

Solving a differential equation

Since you have data for V and C you could fit them with the analytical solution of the differential equation. Let's assume this...

Solving a differential equation

Since you have data for V and C you could fit them with the analytical solution of the differential equation. Let's assume this...

1 year ago | 0

Answered

solving a dynamic equation

Hi @sam - you did not provide enough info for us to try and give a complete answer, but I did some guessing and came up with a s...

solving a dynamic equation

Hi @sam - you did not provide enough info for us to try and give a complete answer, but I did some guessing and came up with a s...

1 year ago | 0

Answered

Forward Euler solution plotting for dy/dt=y^2-y^3

There are a couple of issues with your code 1) Indexes in MatLab start at 1, not 0, so y(0) is not valid syntax and must be rep...

Forward Euler solution plotting for dy/dt=y^2-y^3

There are a couple of issues with your code 1) Indexes in MatLab start at 1, not 0, so y(0) is not valid syntax and must be rep...

1 year ago | 0

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Answered

Dot indexing is not supported for variables of this type.

You are assuming that sh_16_data is a structure. Instead, do sh_16_freq = sh_16_data(:,2)

Dot indexing is not supported for variables of this type.

You are assuming that sh_16_data is a structure. Instead, do sh_16_freq = sh_16_data(:,2)

1 year ago | 0

Answered

find columns adjacent to logical values

Reductive example. Assume this is your matrix A = rand(10,5) and let's assume your logical criteria is that you want to extra...

find columns adjacent to logical values

Reductive example. Assume this is your matrix A = rand(10,5) and let's assume your logical criteria is that you want to extra...

1 year ago | 0

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Answered

Loop plotting for individual years

There's no legend in the example below, because I am not sure what you wanted to do with the cellfun function. Nevertheless, it...

Loop plotting for individual years

There's no legend in the example below, because I am not sure what you wanted to do with the cellfun function. Nevertheless, it...

1 year ago | 0

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Answered

How to vertically concatenate many tables produced from a for loop

I would try something like this M = []; for k=1:numel(A) % automatically brings in the correct amount of tables M = [M;re...

How to vertically concatenate many tables produced from a for loop

I would try something like this M = []; for k=1:numel(A) % automatically brings in the correct amount of tables M = [M;re...

1 year ago | 0

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Answered

plotting graph with 2 different size of vector

Applying diff to a Nx1 array produces an (N-1)x1 array, hence your problem. In truth, you are not really calculating the deriva...

plotting graph with 2 different size of vector

Applying diff to a Nx1 array produces an (N-1)x1 array, hence your problem. In truth, you are not really calculating the deriva...

1 year ago | 0

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Answered

Build a matrix with a gradual value of intensity and an horizontal line with a constant value

A = repmat(linspace(0,1,1000),500,1); A(220:280,:) = 0.5; imshow(A)

Build a matrix with a gradual value of intensity and an horizontal line with a constant value

A = repmat(linspace(0,1,1000),500,1); A(220:280,:) = 0.5; imshow(A)

1 year ago | 0

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Answered

removing specified data from variable

I think the following code is a simpler way of achieving your task, but it does not implement the "pulling a number from a rando...

removing specified data from variable

I think the following code is a simpler way of achieving your task, but it does not implement the "pulling a number from a rando...

1 year ago | 0

Answered

Call different functions inside a function

The way you have explained it in your question is already correct. See the example below. %% Main script mainfunction %% Mai...

Call different functions inside a function

The way you have explained it in your question is already correct. See the example below. %% Main script mainfunction %% Mai...

1 year ago | 1

Answered

Create an airfoil in MATLAB

From the wikipedia page https://en.wikipedia.org/wiki/NACA_airfoil t = 0.25; % maximum thickness as a fraction of the ch...

Create an airfoil in MATLAB

From the wikipedia page https://en.wikipedia.org/wiki/NACA_airfoil t = 0.25; % maximum thickness as a fraction of the ch...

1 year ago | 0

Answered

Saving Multiple .dat files

This should work A = rand(2000,1000); for col = 1:size(A,2) filename = ['Column_',num2str(col),'.dat']; writematri...

Saving Multiple .dat files

This should work A = rand(2000,1000); for col = 1:size(A,2) filename = ['Column_',num2str(col),'.dat']; writematri...

1 year ago | 0

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Answered

MATLAB double addition format long

I suggest reading the following thread https://ch.mathworks.com/matlabcentral/answers/1838113-wrong-sum-50-0-01

MATLAB double addition format long

I suggest reading the following thread https://ch.mathworks.com/matlabcentral/answers/1838113-wrong-sum-50-0-01

1 year ago | 0

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Answered

How do I find slope for large dataset?

Just do A = diff(data)./diff(time);

How do I find slope for large dataset?

Just do A = diff(data)./diff(time);

1 year ago | 0

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Answered

How do i set up a legend for a graph with variable parameters?

t = -2:0.1:4; d = 1; c = 1; A = 1:0.2:2; figure hold on for i = 1:length(A) y= A(i) * (t - d).*(t-c) ; plot (...

How do i set up a legend for a graph with variable parameters?

t = -2:0.1:4; d = 1; c = 1; A = 1:0.2:2; figure hold on for i = 1:length(A) y= A(i) * (t - d).*(t-c) ; plot (...

1 year ago | 0

Answered

Generate Alternating Tones Based On Number Of Cycles

I am still quite unsure if this is what you are asking, but I will give it a go. [t,w] = wave(465); plot(t,w) function [t,f] ...

Generate Alternating Tones Based On Number Of Cycles

I am still quite unsure if this is what you are asking, but I will give it a go. [t,w] = wave(465); plot(t,w) function [t,f] ...

1 year ago | 0