MATLAB: Fplot differentiated symbolic equation

Question

Hello there!

I'm trying to use the fplot function to plot an equation that I defined previously. However I think because I used syms and the diff() function to create the variable I am trying to plot, it is messing up the fplot function. My output is one graph which I already got to plot and an orange error message saying: '''The following error was reported evaluating the function in FunctionLine update: sym output type is not supported. Set 'UniformOutput' to false.'''

Any ideas for how to solve this? All other threads talk about arrayfun or something unrelated, if not, no worries, but thanks!

Answer 1

I would calculate the derivative and create the anonymous function for ‘Vg’ with:

Vg = matlabFunction(diff(Mg,t), 'Vars',{t});

With that change, it runs without error, although the plot generates a long ‘Warning’ message.