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!

Strange integral result in Simulink

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GreenPiece 2019-7-8

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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!