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# Thiago Henrique Gomes Lobato

##### Last seen: 26 days ago
212 total contributions since 2019

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Answered
Graph works fine for 1 value, I am trying to graph 3 values on the same plot
Each N changes the data of the plot, so you need to make it in an outer loop w = .5; %% 2w=1 x = -.5:0.1:.5; %...

1 month ago | 0

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find array dispersed within another array
You could trace the first array on the second backwards: A = [ 1 2 3 4 5 1]; B = [ 1 0 2 0 2 3 4 0 5 1]; positions = zeros(...

2 months ago | 0

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How to fit data with custom function with two variables?
You can minimize the error of your model to the data you want by optimizing the parameters. One alternative for it is, for examp...

2 months ago | 0

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Help determining velocity of Bubbles
The main workflow that you gave is right and one of the names this process is known is optical flow. Matlab has some functions t...

2 months ago | 1

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Answered
Plotting points of intersection using Newton Raphson
Your last line use fixed values, so it will only work for one case. Additionally there was an error in the order of the variable...

2 months ago | 0

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Answered
How to take average of lines in Plot & Plot it as one graph?
Do you have access to the data of all those graphs as a matrix? If so you can do it in a very straight forward way: data = rand...

2 months ago | 0

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How to convert from plot3 to surf?
You have scattered 3d points, surf is made for rectangular grid data. An alternative is to use a function specifically for scatt...

2 months ago | 1

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Answered
How to get range of values from a plot?
The difference between gradient and diff is that the first calculates central differences and the second forward differences, bo...

2 months ago | 0

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Answered
I can't find the mistake in the code
You can't use "abs" since the coefficients/x values can be negative.

9 months ago | 0

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Average of 2 sets of random numbers
Take a look at the binomial generator, it does what you want to.

9 months ago | 1

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Add each row of a matrix consecutively to all the rows of other matrix where both have equal number of columns
You can avoid the loop by using repeated indexing: IndexesA = 1:size(A,1); IndexesA = sort( [IndexesA,IndexesA] ); % IndexesA=...

9 months ago | 0

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Answered
Finding 5th to 15th central moment
The std function has a bias correction which the kurtosis doesn't, if you remove it you get the same result: rng(31415) A = ...

10 months ago | 2

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Extracting numeric values from symbolic variables
x==c The "==" operator is normally used as a logic comparison operation, not an assignment. In the case of using symbolic varia...

10 months ago | 0

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Answered
How to extract detail data from matlab Plot?
If you plot only 118 points you can't get more from the plot. The results are interpolated and probably what you want is a conti...

10 months ago | 0

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Answered
False Output from find-function?
max(A) is a vector, not a number: max(A) ans = Columns 1 through 15 1.0000 1.0000 1.0000 1.0000 1.0000...

10 months ago | 1

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Answered
How can I write a Matlab code on Digital Signals Processing ?
This should work for you, the code is almost self explanatory: L = 1024; Periods = 4; M = 128; A = 1; figure,plot( squareWa...

10 months ago | 0

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Answered
Curve to fit a loglog graph and its equation
There are some issues with your fit. First, log(0) is not defined, so what you expect to become from a fit that uses log(0)? If ...

10 months ago | 0

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How wide range do optimalisation algorithms cover?
All of them except fmincon are unconstrained optimization algorithms, which means they can have any possible value in the group ...

10 months ago | 0

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Answered
In intlinprog how can I put condition for x = 1 or 0
You use a lower and upper bound of 0 and 1, respectively. Then if your number is an integer and should be between 0 and 1, the o...

10 months ago | 0

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Answered
How to display matlab plots in a GUI in python using api engine?
I don't think any python GUI has a canvas which can handle matlab plots directly. What you can do is to save your matlab plot as...

10 months ago | 0

Answered
Matlab App designer 20190a
A push button cannot "stay pushed", as soon as you click it the callback is called and then the state is reset. If what you mean...

10 months ago | 0

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Answered
How to give conditions on transformations of variables in cvx?
As far as I know the Cvx library doesn't accepts fft/ifft. What you can do is to calculate the ifft by "brute force" in a way th...

10 months ago | 0

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retrieve phase information using 'pspectrum'
Why you need the phase? The pspectrum function calculates the power spectrum, which depends on the absolute square of the fft, s...

11 months ago | 0

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Finding the probability of a given x-value on a histogram
If your dataset has discrete values, you don't need to get the histogram, rather just count how many times the median appear and...

11 months ago | 0

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Answered
Make a standalone app
It can be both. With appdesigner you can either create an matlab app (that will run in any other matlab), a web application or a...

11 months ago | 1

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Answered
regression analysis of lagged days
Your first argument should be a matrix with all the variables you need for prediction. So, in your case, you need to form a matr...

11 months ago | 0

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Answered
implementation of a matrix
This should do: rng(42) n = 3; x = rand(n,1); A = ones(n,n+1); Differences = x-x'; for idx=2:n+1 A(:,idx) = A(:,idx-1)...

11 months ago | 0

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Answered
How to calculate steady state with fsolve with white noise in equations ?
That depends on how you define Steady state. If your derivatives are never actually zero, you will never have a fully perfect st...

11 months ago | 1

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Support Vector Machine: Linear or Non-linear
SVM is always linear in the parameters, but using non-linear kernels allows it to consider non-linear relations between the data...

11 months ago | 0

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Answered
Plot the STFT spectrogram
The function tutorials of matlab normally give code examples and results. For you to reproduce the result you just need to run t...

11 months ago | 1

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