[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Different specification of parameters; octave and gnuplot

From: c.
Subject: Re: Different specification of parameters; octave and gnuplot
Date: Sun, 22 Aug 2010 16:51:17 +0200

On 22 Aug 2010, at 14:03, pathematica wrote:

I have no problem, this is not urgent and nothing bad will happen if no one

I am merely interested to know something. It is possible that my confusion
is based on missing a key bit of explanation in the manual.

So ... using gnuplot for 3d plots from octave

I note that when specifying a particular view for a 3d plot (for example to align the visual axis with the line through the origin with the homogeneous
coordinate on the projective plane P2 [k : k : k] to generate radial
symmetry of order three), it is possible to send parameters for azimuth and
elevation as a 1x2 vector using view().

As I am sure you will all know, gnuplot reports the elevation and azimuth on the plot. The parameters are reported in that particular order, whereas octave requires the parameters to be specified in the opposite order, ie
azimuth then elevation. Also, the octave requires the elevation to be
specified as a negative offset from 90 degrees compared with the elevation
reported in gnuplot.

Have I understood this correctly and, if so, is there an interesting
explanation for the different convention (or, perhaps more accurately, the
lack of convention)? Also, is there a reason why the parameters are
specified in degrees rather than radians?

As noted at the beginning - this is merely of interest and it is not urgent.

Thank you so much for octave. (Seriously, thank you; - compliments like this
will always be a form of litotes and they can never do it justice!).

Octave tries to be, as far as possible, compatible with Matlab, so the order and meaning of the parameters of the 'view' command has most likely been chosen to follow those of the same command in Matlab.

reply via email to

[Prev in Thread] Current Thread [Next in Thread]