trying to use look up table dynamic but get an error "breakpoint and table port dimensions must be specified, they cannot be back-inherited." how do I do this

Full error message is

In block 'extrapolating/Lookup

Table

Dynamic', breakpoint and table port dimensions must be specified, they cannot be back-inherited. Recommendation: specify breakpoint port or table port dimensions using upstream blocks.

Suggested Actions

Enable 'warning' or 'error' diagnostics for the list of underspecified signal dimensions.

So i needed to process the transmission output of some glass,and used look up table dynamic to get the data sheet values on a standard wavelength scale

x= 290:10:1400; %wavelength scale I would like

xdata= 350:25:1300; %wavelength scale I have ish, the issue is it's a non uniform set

ydata %are the percent transmission for each wavelegth

Answer 1

[Satwik]

Hi @Alia,

From the error message, it appears that Simulink is unable to determine the dimensions of the input parameters to the Lookup Table Dynamic block. To resolve this issue, I recommend inserting a 'Signal Specification' block before each of the inputs and specifying their respective dimensions in the Signal Specification block dialog parameter 'Dimensions'.

Kindly refer to the following MathWorks documentation for detailed information about the 'Signal Specification' block: https://www.mathworks.com/help/releases/R2024a/simulink/slref/signalspecification.html

I hope this helps!