Romain Gontero

ok you are right, i tried other numbers and in fact i only get the whole part of the number. So i understood the i was defining integer numbers. I need to write e1=1./2.

Hello i have a strange problem with gnuplot. Each time i try to divide numbers the result is 0.... Does anyone know why ?

Thank you a lot Hans, increasing isosample value worked !

Hello everyone, i'm trying to plot a 3d surface in parametric mode, the code is the following : set parametric set angle degree set urange [0:180] set vrange [-90:90] a=10 b=1 c=1 r1(u,v) = cba/sqrt(a2*c2sin(u)2*sin(v)2-b2*c2sin(u)2*sin(v)2-a2*b2sin(u)2+b2c2*sin(u)2+a2*b2) splot u,v,r1(u,v) w pm3d at s But when i plot the curve, the peak of the curve is missing, there should be a peak value of 10 but it show me a peak of 5... Any idea ? Thank you !

Yes thank you, i was looking in this direction this afternoon, the best code i found is the one from Alan Miller, but it appear that the quadratic surface determined by its precodures are always false for a reason that i d'ont understand. I had a look a the code in gnuplot also, but it looks terrible, i can't read it. Thank you for your answer Le 2021-10-18 14:59, Bastian Märkisch a écrit : Instead of implementing your own code, I strongly advise on using a proven existing solution for this kind...

Hello, I'm a PhD student in modeling mechanical behavior of materials. For my work, i need to fit a surface on a 3d curve and i do it with gnuplot which is awesome. But now i need to do it by myself, i need to create in Fortran, an algorithm which do the same thing as gnuplot and i would like to know if it is possible to have a look at the code doing the fit procedure in gnuplot, and how to do that ? Thank you for your help. Romain