x1=time, x2=rpm, x3=volu, f1=result; 
> x1=30; 
> f1:=11.921131-0.140022*x2+0.001034*x3+0.000836*x1*x1+0.001003*x2*x1-0.000052693*x2*x2+0.000177*x3*x1+0.000157*x3*x2-0.000011584*x3*x3;
> plot3d(f1,x1=15..60,x2=0..100,x3=400..800,axes=boxed);

Error, (in plot3d/options3d) unknown or bad optional argument: x3 = 400 .. 800

This is my code. and "Error, (in plot3d/options3d) unknown or bad optional argument: x3 = 400 .. 800" is my problem.

How to i get the solution???

please help me..!! 

Hi.

I want to use canonical analysis or any other method to get vlaue of X1,X2.

How do I get  x 1, x 2 value?

please help!!