fplot keeps returning horizontal line

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I am trying to evaluate the constituents of a source of Californium 252 after a certain number of days. I have defined an expression in terms of other variables that I want to plot. But 'fplot' seems to only return a horizontal line at Y=0. There is no error message when I run the script. Any help is greatly appreciated.

Accepted Answer

Karan Gill
Karan Gill on 30 Oct 2017
You are plotting a constant Atom_Cf_P with value 1.8235e-78. A horizontal line is the expected output. What were you expecting?
madhan ravi
madhan ravi on 3 Jun 2018
whenever you plot a function declare it using sym and then use fplot otherwise Matlab will give a horizontal line at y=0.

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