abs error...(using ga pid tuning)

i don't solve this error

Answer 1

[Walter Roberson]

Don't pass a structure to abs()

That's about all we can say unless you give us more context.

Answer 2

[Jan]

The debugger is the right tool to investigate such problems. Try a dbstop if error in Matlab's command window (does this work under Simulink also?) and run the program again. Then Matlab stops, when the error occurs and you can inspect the local variables.