Programming with SCILAB (pdf)

y =
! 2. 3. 4. 5. !
-->z = f2eval(x,y,f00)
z =
! .9092974 .1411200 - .7568025 - .9589243 !
! 1.8185949 .2822400 - 1.513605 - 1.9178485 !
! 2.7278923 .4233600 - 2.2704075 - 2.8767728 !
Notice that SCILAB already provides such a function (it is called feval):
-->feval(x,y,f00)
ans =
! .9092974 .1411200 - .7568025 - .9589243 !
! 1.8185949 .2822400 - 1.513605 - 1.9178485 !
! 2.7278923 .4233600 - 2.2704075 - 2.8767728 !
SCILAB function feval (or the user-defined function f2eval) can be used for evaluating
matrix of functions of two variables to produce surface plots. Consider the following
case:
-->deff('[z]=f01(x,y)','z = x.*sin(y)+y.*sin(x)')
-->x = [0:0.5:10]; y = [-2.5:0.5:2.5];
-->z = f2eval(x,y,f01);
-->plot3d(x,y,z)
The resulting graph is shown next:
Z
9.7
0.0
-9.7
-2.50
0.00
Y 2.50 10
5
X
0
Or, if you have loaded the PLOTLIB library (see, for example, reference [11]), you can
use, either
--> mesh(x,y,z’)
9.7
0.0
-9.7
-2.50
0.00
2.50 10
5
0
18