Answered

How to find a Y value of a given X?

You want to use an anonymous function. So in your case: % define the anonymous function v = @(t) 50*exp(-1600*t) - 50*exp(-40...

How to find a Y value of a given X?

You want to use an anonymous function. So in your case: % define the anonymous function v = @(t) 50*exp(-1600*t) - 50*exp(-40...

4 days ago | 0

Answered

Find different possible combinations of the rows of two matrices.

a = [1 2 3; 4 5 6; 7 8 10]; % 3 by 3 matrix b=a + 10; % 3 by 3 matrix r=size(a, 1); % create repetitions of values a = re...

Find different possible combinations of the rows of two matrices.

a = [1 2 3; 4 5 6; 7 8 10]; % 3 by 3 matrix b=a + 10; % 3 by 3 matrix r=size(a, 1); % create repetitions of values a = re...

14 days ago | 0

| accepted

Answered

Shepp-Logan phantom dataset

In their paper from 1974, they call these ellipses tumors (see caption of Figure 1) https://web.archive.org/web/20160304035526/...

Shepp-Logan phantom dataset

In their paper from 1974, they call these ellipses tumors (see caption of Figure 1) https://web.archive.org/web/20160304035526/...

3 months ago | 1

| accepted

Answered

Repeating a process with changing file names, possibly with a loop.

Assuming you dont need a001 etc. % N is the number of matrices for ii = 1:N % load or create A %... a...

Repeating a process with changing file names, possibly with a loop.

Assuming you dont need a001 etc. % N is the number of matrices for ii = 1:N % load or create A %... a...

3 months ago | 0

| accepted

Answered

Change pixel color and intensity independently in an image

Here is how i would try to do it: % First, you need to get the image that you see as an RGB-matrix. If your % ratioImage is an...

Change pixel color and intensity independently in an image

Here is how i would try to do it: % First, you need to get the image that you see as an RGB-matrix. If your % ratioImage is an...

3 months ago | 0

Answered

How to repeat number of array by values in another matrix

array = [3 4 2 1]; matrix = [0 2 4 5; 1 3 2 6; 1 0 3 5; 5 6 3 1]; % first, you need a vector with the same length of array t...

How to repeat number of array by values in another matrix

array = [3 4 2 1]; matrix = [0 2 4 5; 1 3 2 6; 1 0 3 5; 5 6 3 1]; % first, you need a vector with the same length of array t...

3 months ago | 1

| accepted

Answered

How can I check that a newly generated sequence is already in the existing structure list or not?

newPerm = [2 1 3 4]; % this line basically runs over the elements of your struct array and checks whether the array in field ...

How can I check that a newly generated sequence is already in the existing structure list or not?

newPerm = [2 1 3 4]; % this line basically runs over the elements of your struct array and checks whether the array in field ...

3 months ago | 0

| accepted

Answered

Using an index in a loop as a variable in another function

You need to provide it as an additional argument (the same holds for d, g, and h): ... alpha(n+1,j) = alpha(n,j) + h * vel...

Using an index in a loop as a variable in another function

You need to provide it as an additional argument (the same holds for d, g, and h): ... alpha(n+1,j) = alpha(n,j) + h * vel...

10 months ago | 0

| accepted

Answered

Array indices must be positive integers or logical values.

The first entry in any kind of Matlab vector/array/matrix... is indexed with 1 (and not 0, as for example in C++). That is why y...

Array indices must be positive integers or logical values.

The first entry in any kind of Matlab vector/array/matrix... is indexed with 1 (and not 0, as for example in C++). That is why y...

11 months ago | 0

Answered

Save elements of an array in a byte variable.

% random array of 8 rows with 4 bytes each bin = logical(round(rand(8, 32))); % how many bytes are there in total NoBytes =...

Save elements of an array in a byte variable.

% random array of 8 rows with 4 bytes each bin = logical(round(rand(8, 32))); % how many bytes are there in total NoBytes =...

12 months ago | 1

| accepted

Answered

Selecting specific values from an array based on a defined condition

Th logical expression 0 <= m+d <= 300 is not interpreted by Matlab as you think it is. It rather is interpreted as (0 <= m+d...

Selecting specific values from an array based on a defined condition

Th logical expression 0 <= m+d <= 300 is not interpreted by Matlab as you think it is. It rather is interpreted as (0 <= m+d...

12 months ago | 1

Answered

How to express coordinate range of an area

You are looking for the colon operator (https://www.mathworks.com/help/matlab/ref/colon.html) x = 1119:1121; y = 392:394;

How to express coordinate range of an area

You are looking for the colon operator (https://www.mathworks.com/help/matlab/ref/colon.html) x = 1119:1121; y = 392:394;

12 months ago | 0

Answered

How to make the binarized image clearer

The problem why your output looks like this is not necessarily to do with the imbinarize function. The problem lies in the way t...

How to make the binarized image clearer

The problem why your output looks like this is not necessarily to do with the imbinarize function. The problem lies in the way t...

1 year ago | 0

| accepted

Answered

Returning negetive numbesr from text file using regexp

With questions like these it's very helpful to have an example of waht exactly your data looks like. If you know exactly how you...

Returning negetive numbesr from text file using regexp

With questions like these it's very helpful to have an example of waht exactly your data looks like. If you know exactly how you...

1 year ago | 0

| accepted

Solved

Vector creation

Create a vector using square brackets going from 1 to the given value x in steps on 1. Hint: use increment.

1 year ago

Solved

Doubling elements in a vector

Given the vector A, return B in which all numbers in A are doubling. So for: A = [ 1 5 8 ] then B = [ 1 1 5 ...

1 year ago

Answered

Swapping the columns based on matrix even length

Assuming that there is always an even number of columns: matrix = repmat(1:10, [3, 1]); L = size(matrix, 2); ind = [2:2:L...

Swapping the columns based on matrix even length

Assuming that there is always an even number of columns: matrix = repmat(1:10, [3, 1]); L = size(matrix, 2); ind = [2:2:L...

1 year ago | 0

| accepted

Answered

How to fuse SPECT and CT images having different matrix sizes?

You can import the data using dicomreadVolume (https://www.mathworks.com/help/images/ref/dicomreadvolume.html) There is an intr...

How to fuse SPECT and CT images having different matrix sizes?

You can import the data using dicomreadVolume (https://www.mathworks.com/help/images/ref/dicomreadvolume.html) There is an intr...

1 year ago | 1

Answered

How can I fit a Gaussian to data that only forms the peak

You should always help your fitting algorithm by setting upper and lower bounds for the parameters. Even more important are star...

How can I fit a Gaussian to data that only forms the peak

You should always help your fitting algorithm by setting upper and lower bounds for the parameters. Even more important are star...

1 year ago | 0

| accepted

Answered

ranking of vector with non-unique elements

So you want to order starting with the highest value? F = [10.1 31.0 20.5 20.5 10.1] [~, ~, rankF] = unique(max(F)-F)

ranking of vector with non-unique elements

So you want to order starting with the highest value? F = [10.1 31.0 20.5 20.5 10.1] [~, ~, rankF] = unique(max(F)-F)

1 year ago | 3

| accepted

Answered

Standard Deviation of 3D matrix with NaN elements

As described in the doumentation for std, there is a flag on how to deal with 'NaN' values. If you want the standard deviation o...

Standard Deviation of 3D matrix with NaN elements

As described in the doumentation for std, there is a flag on how to deal with 'NaN' values. If you want the standard deviation o...

1 year ago | 1

Answered

How to make two numeric field related in GUI?

The 'Callback' property of the uicontrol defines which function to call when you press enter while the edit field is in focus. A...

How to make two numeric field related in GUI?

The 'Callback' property of the uicontrol defines which function to call when you press enter while the edit field is in focus. A...

1 year ago | 0

Answered

How to randomize audio files

What kind of randomization do you want? Play all sounds once, before playing a sound twice? randomizedOrder = randperm(80); ...

How to randomize audio files

What kind of randomization do you want? Play all sounds once, before playing a sound twice? randomizedOrder = randperm(80); ...

1 year ago | 0

Answered

How to reshape a square matrix diagonally to a vector?

I would start with writing down the subscripts in the order you want to select the elements of the matrix. A=[0 1 0; 1 1 1...

How to reshape a square matrix diagonally to a vector?

I would start with writing down the subscripts in the order you want to select the elements of the matrix. A=[0 1 0; 1 1 1...

1 year ago | 1

Answered

How to assign a different name of a matrix for each iteration?

You could use assignin for that purpose: for j = 1 : size(varargout,2) fn = modalfit(varargout{1,j}, f, fs, 10, 'FreqRange', ...

How to assign a different name of a matrix for each iteration?

You could use assignin for that purpose: for j = 1 : size(varargout,2) fn = modalfit(varargout{1,j}, f, fs, 10, 'FreqRange', ...

1 year ago | 0

Answered

for loop values of certain output range

Two possible solutions: x = 3; idx = 1; for c = -2:1:2; for q = -2:1:2; g = (c*x)+q*(c+x); % g at this...

for loop values of certain output range

Two possible solutions: x = 3; idx = 1; for c = -2:1:2; for q = -2:1:2; g = (c*x)+q*(c+x); % g at this...

1 year ago | 0

| accepted

Solved

Alternating sum

Given vector x, calculate the alternating sum y = x(1) - x(2) + x(3) - x(4) + ...

1 year ago