34 total contributions since 2019

Answered

Chaotic number, Chaotic sequence.

What do you mean by chaotic number, random? If so have a look at the functions randn for normal distributed numbers and rand for...

Chaotic number, Chaotic sequence.

What do you mean by chaotic number, random? If so have a look at the functions randn for normal distributed numbers and rand for...

alrededor de 22 horas ago | 0

Answered

any trick to stop fminsearch early?

Yes, there is, you can pass an output function and change the optimization state as soon as your error gets the threshold that y...

any trick to stop fminsearch early?

Yes, there is, you can pass an output function and change the optimization state as soon as your error gets the threshold that y...

alrededor de 22 horas ago | 1

| accepted

Answered

How to erode parts of an image

If you just have one image, doing a matlab code to find the borders would be an overkill, so it would be better to just check th...

How to erode parts of an image

If you just have one image, doing a matlab code to find the borders would be an overkill, so it would be better to just check th...

8 días ago | 0

Answered

Repeat specific elements in vector with keeping the basic vector

repelem indeed solves your problem, you just have to give the repetition indexes as a element-wise argument and pass the whole v...

Repeat specific elements in vector with keeping the basic vector

repelem indeed solves your problem, you just have to give the repetition indexes as a element-wise argument and pass the whole v...

8 días ago | 0

Answered

Shortest path through node group sets

If you have negative weightings an Algorithm that would work to find the shortest path is the Bellman-Ford. You can find some in...

Shortest path through node group sets

If you have negative weightings an Algorithm that would work to find the shortest path is the Bellman-Ford. You can find some in...

8 días ago | 0

Answered

Another "unable to perform assignment because the indices on the left side are not compatible with the size of the right side" thread.

The problem is only about the indexing. When you do something like sV(k, c), you're actually getting a matrix with all possible ...

Another "unable to perform assignment because the indices on the left side are not compatible with the size of the right side" thread.

The problem is only about the indexing. When you do something like sV(k, c), you're actually getting a matrix with all possible ...

8 días ago | 1

| accepted

Answered

Audio Recording on Matlab Issue

Your code is fine, those square signals are just because the low amount of bits in the default audiorecorder which is very low (...

Audio Recording on Matlab Issue

Your code is fine, those square signals are just because the low amount of bits in the default audiorecorder which is very low (...

8 días ago | 0

Answered

Create a matrix that stores rows that are not from a random sample

The function ismember may be what you need to efficiently solve your problem: OriginalMatrix = randn(1020,9); RandomMatrixInde...

Create a matrix that stores rows that are not from a random sample

The function ismember may be what you need to efficiently solve your problem: OriginalMatrix = randn(1020,9); RandomMatrixInde...

8 días ago | 0

Answered

List of paths between two points

It is not so clear by your list what underlying process you have, but I may assume you have a map (graph) where each point is a ...

List of paths between two points

It is not so clear by your list what underlying process you have, but I may assume you have a map (graph) where each point is a ...

8 días ago | 0

Answered

Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

You don't need to declare numerical values with syms your variable sum is the same as the function sum for matlab, this can cau...

Unable to perform assignment because the indices on the left side are not compatible with the size of the right side.

You don't need to declare numerical values with syms your variable sum is the same as the function sum for matlab, this can cau...

8 días ago | 0

| accepted

Answered

Selecting specific region around the known indices of a matrix.

You can dilate the image with a disk kernel and then take the difference to get the indexes: A = load('matlab.mat'); h = fsp...

Selecting specific region around the known indices of a matrix.

You can dilate the image with a disk kernel and then take the difference to get the indexes: A = load('matlab.mat'); h = fsp...

15 días ago | 0

| accepted

Answered

Can i find 'mean' of on column , based on second column ?

You can first find the index where columm 6 is one, save it in a vector and then use it as a mask for your first columm, in this...

Can i find 'mean' of on column , based on second column ?

You can first find the index where columm 6 is one, save it in a vector and then use it as a mask for your first columm, in this...

15 días ago | 0

Answered

Error. I want to plot this ode45 pressure versus time

There were some errors in your code: For ode45 you give numerical functions, not symbolic ones There were some variables that ...

Error. I want to plot this ode45 pressure versus time

There were some errors in your code: For ode45 you give numerical functions, not symbolic ones There were some variables that ...

15 días ago | 0

| accepted

Answered

How to find the maximum value for each 2 rows in an array?

If I understood right you want the maximum element-wise matrix entry between the two matrices that appear in your 3rd dimension ...

How to find the maximum value for each 2 rows in an array?

If I understood right you want the maximum element-wise matrix entry between the two matrices that appear in your 3rd dimension ...

15 días ago | 0

| accepted

Answered

How to plot boundary of an image from any given distance

Your input is just the image, so I can't check the solution in your exact data, but this should either way solve your problem or...

How to plot boundary of an image from any given distance

Your input is just the image, so I can't check the solution in your exact data, but this should either way solve your problem or...

15 días ago | 0

Answered

How to calculate correlation coefficients for each corresponding pixel of two images(of same dimensions)? I need the output also to be of same dimension.

I believe they used a slided window cross correlation, which is basically the same as if you use corr2 (which will give you just...

How to calculate correlation coefficients for each corresponding pixel of two images(of same dimensions)? I need the output also to be of same dimension.

I believe they used a slided window cross correlation, which is basically the same as if you use corr2 (which will give you just...

22 días ago | 0

| accepted

Answered

Adding a piecewise time dependent term in system of differential equation

The conditional statement idea is right, the problem was that you considered that the ode45 would evaluate your function only at...

Adding a piecewise time dependent term in system of differential equation

The conditional statement idea is right, the problem was that you considered that the ode45 would evaluate your function only at...

22 días ago | 2

| accepted

Answered

Using a For Loop to calculate the pi for a taylor series

You can do it in a way to test multiple n's at giving input, as for example "[10,100,1000]" as input: clear;clc; format Long ...

Using a For Loop to calculate the pi for a taylor series

You can do it in a way to test multiple n's at giving input, as for example "[10,100,1000]" as input: clear;clc; format Long ...

22 días ago | 1

Answered

Use reshape to image with 3 dims

A = randn(6000,28,28); newA = reshape(A,[28 28 6000]); size(newA) imshow(newA(:,:,1)) size(newA) ans = 28 ...

Use reshape to image with 3 dims

A = randn(6000,28,28); newA = reshape(A,[28 28 6000]); size(newA) imshow(newA(:,:,1)) size(newA) ans = 28 ...

22 días ago | 0

Answered

Hazy image equation implementation.

Can it be possible that you are just making a wrong conversion of your image data? With the code below I show an example of what...

Hazy image equation implementation.

Can it be possible that you are just making a wrong conversion of your image data? With the code below I show an example of what...

29 días ago | 0

Answered

To generate following sequence

You can plot it actually pretty easily, just make sure to use your own u vector below : n = 4:100; u = ones(1,97); y = 5 .*...

To generate following sequence

You can plot it actually pretty easily, just make sure to use your own u vector below : n = 4:100; u = ones(1,97); y = 5 .*...

29 días ago | 0

Answered

i have removed frequency from (3-200)HZ from FFT signal.Now i want to remove noise from last figure which is in time domain so that i can transmit signal.Thanks in advance.

For your signal a median filter may work fine enough. clc,close all,clear all codn=70; % fc=6e+3; fs=3600; bode=10; cod...

i have removed frequency from (3-200)HZ from FFT signal.Now i want to remove noise from last figure which is in time domain so that i can transmit signal.Thanks in advance.

For your signal a median filter may work fine enough. clc,close all,clear all codn=70; % fc=6e+3; fs=3600; bode=10; cod...

alrededor de 1 mes ago | 0

| accepted

Answered

How to apply a bound constraint on a complex power vector

Saying that a complex number is bigger than the other is not so simple, you're comparing the magnitue? The real part? The imagin...

How to apply a bound constraint on a complex power vector

Saying that a complex number is bigger than the other is not so simple, you're comparing the magnitue? The real part? The imagin...

alrededor de 1 mes ago | 0

| accepted

Answered

Remove strings from an array based on string length

For you to do the comparison you must first convert the string to a numeric. The following code should solve your problem: clc;...

Remove strings from an array based on string length

For you to do the comparison you must first convert the string to a numeric. The following code should solve your problem: clc;...

alrededor de 1 mes ago | 0

| accepted

Answered

Conditional values and equations

What you want to do is a non-linear optimization of the three parameters alpha, gm and gs. For you to do this you have to define...

Conditional values and equations

What you want to do is a non-linear optimization of the three parameters alpha, gm and gs. For you to do this you have to define...

alrededor de 1 mes ago | 0

| accepted

Answered

Plotting amplitude and phase spectrum

This amplitude and phase spectrum plot of a transfer function is called the Bode plot , it is very well known and you may easily...

Plotting amplitude and phase spectrum

This amplitude and phase spectrum plot of a transfer function is called the Bode plot , it is very well known and you may easily...

alrededor de 1 mes ago | 1

Answered

Integrate y=x*sin(a*x^4).*exp(x^2./2)

Matlab can't find the close integral form for all functions (some may even not have one). If you are interested only in the valu...

Integrate y=x*sin(a*x^4).*exp(x^2./2)

Matlab can't find the close integral form for all functions (some may even not have one). If you are interested only in the valu...

alrededor de 1 mes ago | 0

| accepted

Answered

Polyfit not showing a curve

polyfit only get you the coefficients, you then have to actually evaluate some values to get the curve. An easy alternative is t...

Polyfit not showing a curve

polyfit only get you the coefficients, you then have to actually evaluate some values to get the curve. An easy alternative is t...

alrededor de 1 mes ago | 0

| accepted

Answered

Determine daily derivative of time series data

For you to calculate the daily derivative you have to define a daily measurement for your variables. Normally the average is a ...

Determine daily derivative of time series data

For you to calculate the daily derivative you have to define a daily measurement for your variables. Normally the average is a ...

alrededor de 1 mes ago | 0

| accepted

Answered

Legend with text and values of array

You can pass an cell array of strings to the legend() (here for documentation https://de.mathworks.com/help/matlab/ref/legend.ht...

Legend with text and values of array

You can pass an cell array of strings to the legend() (here for documentation https://de.mathworks.com/help/matlab/ref/legend.ht...

alrededor de 1 mes ago | 1

| accepted