On 2/17/2009 11:33:38 AM, GR_Aero wrote:
>Hi Richard and Jim,
>
>What is difference between the
>surface created by CreateMesh
>and polynomial surface formed
>with coeffs1 and coeffs2. I
>think they should be same, but
>the former is generated for
>easy viewing. Am I right? Can
>we view polynomial form
>directly? Thanks.
______________________________
The bivariate fit is fit(u,v) as defined. This definition is for the QuickPlot and you have the bother to range both directions and you don't have an export. You can have an export from fit(u,v) by assigning to a matrix. The Createmesh is an advanced Mathcad built-in function. It creates a nested matrix of 3 planes...they are X, Y, Z
In this simple case of 3D surface, the X, Y planes are simply linear plane (just a piece of plywood in both directions). The Z plane is the "matrix valued level" corresponding to each mesh, that matrix is the same as if you would assign f(u,v) to a matrix.
The bivariate extract-export is tutored in the work sheet.
Please feel free for more.
jmG