Error - 'Argument of log must be positive'

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Aled 2021-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/715903-error-argument-of-log-must-be-positive

评论： Om 2024-6-11

Hi all,

I am trying to run a simple model to assess mass flow and temperature in a chain of 3-port gas volumes taken from the ventilation custom libary. However i get an error when running the simulation, see attached images.

The mass flow has been set to 0.5kg/s and a temperature of 200degC used at the reservoir and temperature input to the volume blocks.

Thanks

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Om 2024-6-11

Hello,

Does your custom library have a math function block (which has logarithm selected) anywhere?. The error message is indicating an error in the three port vertical section of your custom library.

It seems as if you are trying to take the log of a negative number there, which is not allowed.

You can check its documentation here:

Math function documentation

Thanks

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