error with graphing exp function

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seldiora 2019-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/455653-error-with-graphing-exp-function

编辑： seldiora 2019-4-11

in my code I tried having e to some negative power and graph it but it's not working, any help?

r = 0.5; l=4;
%%given: A(1) and A(2) are two numbers from a vector, and r(1) and r(2) are two other numbers from another vector
vct = A(1)*exp(r(2)*x)+ A(2)*exp(r(1)*x);
x = 0:2:20
figure
expfunc = exp(-x*r/l) %%I want e^(-x*r/l) for that part
plot(x,vct/0.5*(1-expfunc)) %%overall equation should be: vct/0.5*(1-e^(-x*r/l))

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James Tursa 2019-4-11

I could fix your code so it didn't generate errors, but it might not be correct for the problem you are trying to solve. Can you give us the actual wording of the assignment?

seldiora 2019-4-11

so, I want to graph the current for an inductor. [http://hyperphysics.phy-astr.gsu.edu/hbase/electric/imgele/indt.png] However since the voltage (vct) varies with time, I want to use vct/r*... [the rest is in the image]

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