Error: Values of BreakpointsForDimension1 in 'Lookup_table' must be monotonically increasing.

Hello,

I'm frustrated with the error that I'm getting while running my simulink model which has a 1-D lookup table. The lookup data is a nx1 matrix which is generated in an ODE45 integration. The error is:

Values of BreakpointsForDimension1 in 'output_control/Normal force' must be monotonically increasing.

I looked at other Q/As here but I couldn't understand them. Can someone please give me a workaround to this problem in an easy language so that a rookie in simulink like me can understand? I really appreciate it.

[Swarooph]

Having the data and a simple model trying to use it will help us understand. Looks like a problem with dimensions of either data/breakpoints. But impossible to help without knowing more about the actual data.

Answer 1

[Fangjun Jiang]

The 1-D lookup table block has a parameter called "Breakpoints 1". It is a vector. The value needs to be incremental, for example [1, 1.1, 1.3]. If the value is not incremental, such as [1 2 2] or [1 3 2], the error message will appear.

Answer 2

[babak znl]

hello I also had this problem but i found a solution. i used 2 lookup table instead of one , one lookup table for the incremental part and one for the decremental part, so you should separate your data from that break point from which error occurs , and you can use simple logic blocks to to direct the input data to the desired lookup table.

[mechetoune walid]

Can you give me an example.

[Siddharth Kamila]

How to do this, can you briefly explain this.

Answer 3

[Vignesh]

In my case, i was reading the data from an excel using worng function "readtable".

Instead using "readmatrix" for nx1 data fixed the issue in Lookup table BreakpointForDimention issue.