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Anders's questions

Martin Hope
Anders
Asked: 2016-01-16 05:45:41 +0800 CST
  • 0

I am new to C++, and I have troubles to get going. I want to re-implement a code, written in GNU Octave, using C++. I would, however, still want to use some GNU Octave functionality in that C++ code.

I have installed GNU Octave 4.0.0 on Ubuntu 14.04 LTS. My problem is that I can not even compile, since the 'octave/oct.h' is missing?

A simple code 

#include <iostream>
#include <octave/oct.h>

using namespace std;

int main ()
{

  Complex number = Complex(0, 1);
  cout << number;

}

when compiled with g++ (4.8.4) produces:

"fatal error: octave/oct.h: Aucun fichier ou dossier de ce type #include compilation terminated.".

Thanks for your help.

c++
Martin Hope
Anders
Asked: 2015-05-31 10:40:31 +0800 CST
  • 2

Every time I start DraftSight (14.04 LTS) I am asked to activate the product. I have filled in the required questionnaire several times over but the product activation is not triggered. In a couple of days the trial period expiries so I would be glad if I could get some help solving this issue before that.

My installed version is

apt-cache policy draftsight
>> draftsight:
>>  Installé : 2015.2.0.2052
>>  Candidat : 2015.2.0.2052
>> Table de version :
>> *** 2015.2.0.2052 0
>>        100 /var/lib/dpkg/status
cad
Martin Hope
Anders
Asked: 2015-05-24 07:42:58 +0800 CST
  • 0

I am having big troubles producing quality plots with the default GNU Octave (3.8.1) which comes with Ubuntu 14.04 LTS. I am trying to re-run some existing code (thousands of lines of code) and the code is broken because there are intermediate plots with legends here and there. I know that the code base is legitimate GNU Octave code.

Here is a minimal crashing example:

graphics_toolkit('gnuplot') # I need this for TeX-like labels,
                            # but I doubt this cause a trouble with legend
R = 2000; 
N = R/4;
t = (0:N-1)/R;
figure # plot without legend which works fine
plot(t*1000, sin(2*pi*100*t), 'b')
xlabel('t ms')
ylabel('p_e Pa')
figure # plot with legend which crash
plot(t*1000, sin(2*pi*100*t), 'b; sine wave;')
xlabel('t ms')
ylabel('p_e Pa')

This is the output in GNU Octave:

>> error: invalid value = northeast
>> error: set: invalid value for radio property "location" (value = northeast)
>> error: called from:
>> error:   /usr/share/octave/3.8.1/m/plot/appearance/legend.m at line 995, column 11
>> error:   /usr/share/octave/3.8.1/m/plot/draw/private/__plt__.m at line 149, column 7
>> error:   /usr/share/octave/3.8.1/m/plot/draw/plot.m at line 220, column 10
octave