# Questions tagged [octave]

Octave is a scientific programming & scripting language with syntax similar to MATLAB and SCILAB.

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### Is it possible to use Octave to learn MATLAB programming?

I want to learn MATLAB programming so that I can conduct some researh/analysis on my own and also, so that I can study/modify some MATLAB scripts that I have found online etc. However, the problem is ...
29k views

### Euclidean distance in Octave

I would like to know if there is a quick way to compute the Euclidean distance of two vectors in Octave. It seems that there is no special function for that, so should I just use the formula with <...
15k views

### Alternatives to Comsol Multiphysics

This might be a question better suited for the Software Recommendations side of S.E., however I do believe that people who frequent this part of S.E. are more likely to be able to answer this question....
11k views

### Octave: calculate distance between two matrices of vectors

Suppose I have two matrices Nx2, Mx2 representing N, M 2d vectors respectively. Is there a simple and good way to calculate distances between each vector pair (n, m)? The easy but inefficient way is ...
4k views

### fmincg implementation in Python

I'm trying to re-implement Neural Networks in Python. I implemented the cost function and the backpropagation algorithm correctly. I have checked them by executing its Octave equivalent code. But ...
220 views

### Converting from planar polynomial domain to planar polygon

Let's assume we have a planar domain whose boundary can be described with a polynomial curve (like Bezier curves). Now assume that you want to produce a discretization of the boundary, i.e. you want ...
3k views

### Plotting x,y coordinates and vectors with octave

I have a data set containing the recorded data from a car's motion (latitude,longitude, and heading). I'd like to plot the (lat,lon) points on a 2D plot with a unit vector pointing in the direction ...
1k views

### Python syntax for MATLAB/Octave colon operator a:dx:b

I am trying to rewrite some MATLAB/Octave code in Python, and I don't know what would be the nicest or most intuitive way of writing ...
4k views

### BLAS libraries for Octave or Matlab, preferrably with GPU support?

I just searched around a bit for BLAS implementations and was amazed by the sheer amount of libraries around. Does someone know of a benchmark or otherwise rating of the various libraries? How easy ...
307 views

### Computational time not proportional to integration interval in ODE-solver?

I am running octave and i have been trying ode45, ode54, ode23 etc to integrate the equation ` $$Q''(t) = B\cos(Q)\sin(\omega t)$$ $$Q(t=0)=0.$$ When the time interval to be integrated increases, the ...
638 views

### Finite difference method basic implementation on Octave

Trying to study the error of FDM for a second order derivative versus step size I calculated the coefficients and validated them, but the output has errors for small step sizes. The function in ...
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### Octave 3D mesh, data from file

I have a big file with 3 columns: density, dimension, value. example: 10 0.3 200 10 0.4 300 20 0.3 250 20 0.4 320 ... I am trying to draw a 3d plot - ...
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### Partial differential equations with octave [closed]

I need to find a numerical solution for $-\Delta U = f$, on the $\Omega = [0,1]^2$, with $U|_{\partial \Omega} = 0$. I found a method: POISSONFD in ...
351 views

### In Octave, how do I specify that the solution to a matrix equation should be over integers?

In Octave, how do I specify that the solution to a matrix equation should be over integers? I.e., Given matrix $A$, vectors $x$ and $b$; $Ax=b$. Find vector $x=A^{-1}b$ such that all its entries are ...
659 views

### eigs routine in octave [closed]

I am using octave and observed a problem with the eigs-routine for non symmetric matrices. Using GNU octave version 3.8.1 the code below gives significant difference of eigenvalues although same ...
187 views

### Solve chemical formula (number of molecules in reaction)

In order to balance atom count in chemical equation: a O2 + b C12H24O11 → c CO2 + d H2O I make linear equation: ...
669 views

### Defining Cauchy principal value in MATLAB (or Scilab/Maple)?

How to define a variable which is an integral involving cauchy principal value inside in any computer programming language? I want to know how to break down the procedure step by step from a ...
74 views

### Unforeseen behaviour of fix() in Octave and Scilab

I encountered some odd results when using the function fix() in Octave and Scilab. The following is input and output of the Scilab console but the exact same thing happens in Octave. I start with the ...
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### quiver3 gives non-conformant arguments?

Does anyone know why I'm seeing these errors? I'm not giving it a matrix. ...