Lookup Table in Simulink

Hello

How can I design a table consisting of two inputs and two outputs using the lookup table tool in Simulink?

For example, the first input is length, the second input is width, the first output is area, and the second output is volume

Answer 1

[Paul]

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.

[wafaa almayahi]

Thank you for your answer, but I don't understand what you mean by the first and second pages to enter the values of the output

[Paul]

Suppose area and volume are both 3x3 arrays

area = rand(3);
volume = rand(3);

Create a 3D array as

tabledata = cat(3,area,volume)

tabledata = 
tabledata(:,:,1) =

    0.0067    0.3951    0.5523
    0.8955    0.5017    0.9367
    0.2048    0.7986    0.8123


tabledata(:,:,2) =

    0.0032    0.0055    0.0774
    0.1875    0.4014    0.4446
    0.6051    0.1831    0.1433

Enter tabledata or the cat(3,area,volume) as the Table Data block parameter.