MISO Polynomial Models

Hey,

1: My task is to generate some polynomial models (5-input , 1-output). Now I'm looking for the common procedure for that. I might use any toolbox, but I don't want to use any self-made functions or GUIs like the polyfitn or the gapolyfitn. Actually I use to work with the MBC-Toolbox to generate these Models. Is there another way, contained in any toolbox package?

2: Another task is to compare 3 polynomial models with the same 5 inputs but 3 different outputs. There I have to figure out the input parameters u1(i_1),u2(i_2),...u5(i_5) to reach the minimum for the output1 min(y1) by satisfying some criteria for the other output values like

y2 > 10

y3 < 0.1

Does any numerical soltutions exist for that kind of problem? Which one would be advisable?

Michael