Re: octave plots/graphics

2019-04-16 Thread Bruno Schneider 
Answering to myself for future reference:

I installed fonts-freefont-otf and the problem seems to be fixed. This
package is not recommended nor suggested by octave.

I couldn't find a way to configure a different font file as default font.

-- 
Bruno Schneider

Re: octave plots/graphics

2019-04-16 Thread Henning Follmann 
On Tue, Apr 16, 2019 at 10:21:35AM -0300, Bruno Schneider wrote:
> I have just installed octave and it seems I'm missing some parts. I'm
> using Debian testing with XFCE. I have the following packages
> installed:
> 
> $ dpkg -l | grep octave
> ii  liboctave6:amd64  4.4.1-5
> ii  octave4.4.1-5
> ii  octave-bsltl  1.1.1-2
> ii  octave-common 4.4.1-5
> ii  octave-doc4.4.1-5
> ii  octave-image  2.10.0-2
> 
> On octave, i enter the following commands:
> 
> x = linspace(0, 2*pi);
> a = cos(2*x);
> plot(x, a);
> 
> Then, a window appears with menus, but the drawing is completely blank.
> 
> I get some font errors. I don't know if they affect the graph:
> 
> warning: ft_manager: unable to load font:
> /usr/share/fonts/opentype/freefont/FreeSans.otf
> warning: called from
> axes at line 66 column 10
> newplot at line 158 column 10
> plot at line 222 column 9
> warning: ft_text_renderer: unable to load appropriate font
> 
> It seems I'm using Qt for graphics but my system seems to have all
> libqt5* packages installed. I also tried gnuplot graphics and the
> window was also blank.
> 
> Am I missing packages?
> 

Why do you ignore the *very clear* error message?
try 
apt install fonts-freefont-otf

And then check if the plot works.


> Can I configure octave to use other fonts instead?
> -- 
> Bruno Schneider
> 

-- 
Henning Follmann   | [email protected]

octave plots/graphics

2019-04-16 Thread Bruno Schneider 
I have just installed octave and it seems I'm missing some parts. I'm
using Debian testing with XFCE. I have the following packages
installed:

$ dpkg -l | grep octave
ii  liboctave6:amd64  4.4.1-5
ii  octave4.4.1-5
ii  octave-bsltl  1.1.1-2
ii  octave-common 4.4.1-5
ii  octave-doc4.4.1-5
ii  octave-image  2.10.0-2

On octave, i enter the following commands:

x = linspace(0, 2*pi);
a = cos(2*x);
plot(x, a);

Then, a window appears with menus, but the drawing is completely blank.

I get some font errors. I don't know if they affect the graph:

warning: ft_manager: unable to load font:
/usr/share/fonts/opentype/freefont/FreeSans.otf
warning: called from
axes at line 66 column 10
newplot at line 158 column 10
plot at line 222 column 9
warning: ft_text_renderer: unable to load appropriate font

It seems I'm using Qt for graphics but my system seems to have all
libqt5* packages installed. I also tried gnuplot graphics and the
window was also blank.

Am I missing packages?

Can I configure octave to use other fonts instead?
-- 
Bruno Schneider