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Strange integral result in Simulink

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GreenPiece 2019 年 7 月 8 日
Hi everyone,
I tried to integrate a signal in the Simulink as follows:
  • In the first case:
The ld_d signal is blue which is output from a matlab function block. Clearly, its value are negative during the simulation time. However, the integrated signal is positive. I cannot understand how it could happen.
  • In the second cas, I tried to save the ld_d to .mat file then load it again into other simulink file and do the integrating. The integrated result in this implementation is negative which I expected.
Could you please explain why the signal ld1 can be positive in the first case.
The following is the result of the first case.
Thanks in advanced!

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