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Thiago Henrique Gomes Lobato


34 total contributions since 2019

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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...

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...

alrededor de 22 horas ago | 1

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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

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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

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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

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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

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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

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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

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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

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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

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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...

15 días ago | 0

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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...

15 días ago | 0

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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

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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

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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

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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

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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...

22 días ago | 2

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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 ...

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 ...

22 días ago | 0

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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

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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

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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

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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...

alrededor de 1 mes ago | 0

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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;...

alrededor de 1 mes ago | 0

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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...

alrededor de 1 mes ago | 0

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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...

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...

alrededor de 1 mes ago | 0

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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...

alrededor de 1 mes ago | 0

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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 ...

alrededor de 1 mes ago | 0

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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...

alrededor de 1 mes ago | 1

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