Hi wafaa,
If the area and volume are both represented by by 2D arrays of the same size, and if the length and width input breakpoints are the same for both, then you can use the n-D Lookup Table block.
Store the area and volume arrays in a 3D array with the first page being the area table and the second page the volume table.
Then, in the block parameters, specify Number of Table Dimensions as 3, and the table data 3D array and the length and width breakpoints in the Table Data, Breakpoints 1, and Breakpoints 2 parameters (assuming you want to specify those parameters via Dialog) respectively. Specify Breakpoints 3 as 1:2.
The first two external inputs to the block are the length and width values for the lookup. Make the third input a Constant block with the Constant Value parameter set to 1:2.
