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# Manuel

31 total contributions since 2009

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Posted

Implicit function using contour
Hello. I'm using the code [C,~] = contour(x,y,Z,[0,0]) in order to obtain the points (x,y) such that Z(x,y) = 0, and I was won...

6 years ago | 1049 views

Posted

Working with more decimals while using fzero
Hello. Im using fzero to find a zero of a function wich is very large in nature. My problem is that if I use the following [x, ...

7 years ago | 1420 views

Responded

Re: Transforming data using logarithms.
Thanks, worked like a charm. Actually what I was looking for was to find zeros of A, but being of exponential nature, it was ha...

7 years ago | 3434 views

Posted

Transforming data using logarithms.
Hello guys. My problem is the following: Lets say I have a matrix of data A which increases (and decreses) exponentially, and I...

7 years ago | 3434 views

Responded

Re: Calling rows of a function.
Excelent! Thanks a lot guys.

7 years ago | 3479 views

Responded

Re: Calling rows of a function.
Finally! Thanks, that was the answer I was looking for. % t = [1 2] F(t,1) % Calls the first column. F(t,2) % Calls the second c...

7 years ago | 3479 views

Responded

Re: Calling rows of a function.
I'm not mistaking anything. I'm talking in the MATEMATHICAL sense. So a function f(t) can be a scalar, a vector, a matrix or a t...

7 years ago | 3479 views

Responded

Re: Calling rows of a function.
Sorry, it says "(m x n)" and should have said "(m x m)". Also, it says "recursively". What I meant was "in a loop".

7 years ago | 3479 views

Responded

Re: Calling rows of a function.
A function cannot have rows or columns? If F(t) : R^n ---> R^p x R^q then F can be viewed as a matrix of p rows and q columns....

7 years ago | 3479 views

Responded

Re: Calling rows of a function.
Sorry, I meant columns. Let's say t is a vector in R^n, so A(t) is in R^n x R^2. What I meant is if I can call the second colum...

7 years ago | 3479 views

Posted

Calling rows of a function.
My question is very simple: Suppose I define a function as function A = A1(t) end and then I want to call only the second row...

7 years ago | 3479 views

Posted

Vector of polynomial coefficients
I want to find the roots of the following polynomial p(x) = x(1+ax)^13 - b(1+ax)^6 + c and I'm having troubles creating the vect...

7 years ago | 1228 views

Posted

Running Matlab in a specific core
Hi. I was wondering if there is a way to make Matlab run in a specific core. What I want to do is run one matlab console on CPU1...

7 years ago | 2867 views

Responded

Re: Suming one row if others are identical
I've been trying to understand how does the code work, but I can't figure it out. Can somebody please explain it to me?

7 years ago | 2738 views

Posted

Suming one row if others are identical
Hi. Let's say I have the following matrix: A = [0.123, 0, 0, 0; What I like to do is sum the first column of the rows 1, 2, 5,...

7 years ago | 2738 views

Responded

Re: Multiplying multivariable polynomials
Never mind, I think I got it.

7 years ago | 3248 views

Responded

Re: Multiplying multivariable polynomials
I'm still a little confused. If I want to do the product of P(x,y,z) = a + b x + c y + d z and Q(x,y,z) = e + f x + g y + h ...

7 years ago | 3248 views

Responded

Re: Multiplying multivariable polynomials
But how can I implement it? I'm a bit confused on what to input and what does the output means.

7 years ago | 3248 views

Posted

Multiplying multivariable polynomials
Hello, I'm trying to create a function similar to conv in order to multiply polynomials in several variables. I know that if P...

7 years ago | 3248 views

Responded

Re: Formating equation for the use of 'roots'
Thanks a lot guys, I'll try your suggestions and tell you how it went.

7 years ago | 1789 views

Responded

Re: Formating equation for the use of 'roots'
The coefficients are fixed (specified somewhere in the code) and the power is x^2. Sorry about that.

7 years ago | 1789 views

Posted

Formating equation for the use of 'roots'
I need to find out the roots of a polynomial, but the problem is that is not in canonical form. To be more clear, I need to find...

7 years ago | 1789 views

Responded

Re: Finding all roots for a polynomial system
I used PHCLab, and adaptation of PHCPack for Matlab. It turned out it wasn't trivial at all. Here is the link: http://www.math....

7 years ago | 8329 views

Responded

Re: Finding all roots for a polynomial system
Never mind. Got it to work.

7 years ago | 8329 views

Responded

Re: Finding all roots for a polynomial system
Ok. A little update to see if someone can help. What I've done is the following: Imagine I have an m-file defininf the functio...

7 years ago | 8329 views

Responded

Re: Finding all roots for a polynomial system
It's a system of 8 polynomials (most of them linear) in 8 variables, and the biggest degree is 12 (for starters, later I'll like...

7 years ago | 8329 views

Responded

Re: Finding all roots for a polynomial system
I might have understated the question (maybe because hardly a system of polynomial equations + movable parameters in one variabl...

7 years ago | 8329 views

Responded

Re: Finding all roots for a polynomial system
It might look like a stupid quiestion, but if you'd bothered to read the sentence carefully, you would have noticed that I need ...

7 years ago | 8329 views

Responded

Re: numeric use of solve
Thanks for the reply. Indeed it seems that fsolve can do the trick for me. A finall question: Is there a way to capture more th...

7 years ago | 3769 views

Posted

Finding all roots for a polynomial system
Hi. I'm trying to create a function that, for any values of some parameters, it finds all roots of a given polynomial system. An...

7 years ago | 8329 views