[Octave-bug-tracker] [bug #46952] ezsurf should emit an error when given 5 inputs

[Rik]

Update of bug #46952 (project octave):

                  Status:                    None => Confirmed              
                 Summary: The axis are not correctly numbered => ezsurf should
emit an error when given 5 inputs

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Follow-up Comment #1:

The function ezsurf is not being called correctly in your example code. 
Octave should probably issue an error rather than continue, but the easiest
thing is to fix your code.


R = 1;
H = 1.5;
fx = @(th,rho) rho.*cos(th);
fy = @(th,rho) rho.*sin(th);
fz = @(th,rho) rho.*H/R;

figure;
ezsurf(fx,fy,fz,[0,1],[0,2*pi])


ezsurf is being called with 5 arguments but that doesn't conform to any of the
accepted invocation methods.


 -- Function File:  ezsurf (F)
 -- Function File:  ezsurf (FX, FY, FZ)
 -- Function File:  ezsurf (..., DOM)
 -- Function File:  ezsurf (..., N)
 -- Function File:  ezsurf (..., "circ")
 -- Function File:  ezsurf (HAX, ...)
 -- Function File: H = ezsurf (...)


I think you are looking to call


ezsurf (FX, FY, FZ, DOM)


>From the documentation,


If three functions are passed, then plot the parametrically defined
function `[FX (S, T), FY (S, T), FZ (S, T)]'.

If DOM is a two element vector, it represents the minimum and
maximum values of both X and Y.  If DOM is a four element vector,
then the minimum and maximum values are `[xmin xmax ymin ymax]'.


>From your definition of


fx = @(th,rho)


it seems that the first variable should run from 0 to 2PI and the second from
0 to 1.  Indeed, the following produces the correct plot.


ezsurf (fx,fy,fz, [0, 2*pi, 0, 1])


I changed the Summary to reflect the open issue.

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