octave

I have a QT C++ application that runs the Octave program using QProcess. I am able to communicate with it by reading the standard output/error and writing to it's standard input using write method (for example: octave->write("5 + 5\n");). As I told you I get response from octave (from the above example I get "ans = 10"). However, when the command I write to Octave standard input has a "plot" (for example, a simple plot([1 2 3 4 5]);), the actual graphic is never shown. I know Octave runs gnuplot, I have it installed, and gnuplot_x11 too. I even change the gnuplot binary path in my Octave

In Matlab, the tilda symbol can be used to ignore a certain parameter from a function that returns multiple parameters. However, when I try the same code in Octave, I get a syntax error. I have two questions: Why does Octave not support this? (i.e. bug, future enhancement, design decision, etc.) What's the alternative syntax in Octave, if any (without just putting a "dummy variable" into the spot then clearing that variable)? Additionally, is this alternative syntax Matlab compatible? % this is valid Matlab code, but will result in a syntax error in Octave [colA, colB, ~, colC] = textread(

I recently downloaded the latest stable release of Gnu Octave, and was attempting to build and install it on my machine (Ubuntu 10.0.4 LTS 64bit). When I run ./configure, I got this error message: configure: error: You are required to have BLAS and LAPACK libraries Does anyone know Where do I obtain these libraries from? Try to run this apt-get install libblas-dev libatlas-dev liblapack-dev All libraries, required by octave package in ubuntu are listed here: http://packages.ubuntu.com/lucid/octave3.2 and to build new octave you need -dev packages of some listed libs. The octave in ubuntu

In Octave, I can do octave:1> A = [1 2; 3 4] A = 1 2 3 4 octave:2> A(A>1) -= 1 A = 1 1 2 3 but in Julia, the equivalent syntax does not work. julia> A = [1 2; 3 4] 2x2 Array{Int64,2}: 1 2 3 4 julia> A[A>1] -= 1 ERROR: `isless` has no method matching isless(::Int64, ::Array{Int64,2}) in > at operators.jl:33 How do you conditionally assign values to certain array or matrix elements in Julia? Your problem isn't with the assignment, per se, it's that A > 1 itself doesn't work. You can use the elementwise A .> 1 instead: julia> A = [1 2; 3 4]; julia> A .> 1 2×2 BitArray{2}: false true true true

anyone can help me with this error? octave:4> pkg install signal-1.2.0.tar.gz error: the following dependencies where unsatisfied: signal needs optim >= 1.0.0 signal needs specfun >= 0.0.0 signal needs control >= 2.2.3 signal needs general >= 1.3.2 octave:4> pkg install optim-1.2.2.tar.gz error: the following dependencies where unsatisfied: optim needs miscellaneous >= 1.0.10 optim needs struct >= 1.0.10 octave:4> pkg install struct-1.0.10.tar.gz make: /usr/bin/mkoctfile: Command not found make: *** [fields2cell.oct] Error 127 'make' returned the following error: make: Entering directory `/tmp