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Plotting symbolic equation in matlab

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Md. Ashikur Rahman Any
评论： Cris LaPierre 2021-4-18
whats wrong with this?
Here i tried to plot a sybolic equation for range x=[1,20] but it shows
How to fix it .and plotting the curve

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Cris LaPierre
Cris LaPierre 2021-4-18
Ran in:
Try creating your symbolic equation using the approach shown in the examples here.
syms eq(x)
eq(x) = (sin(sqrt(x)+5)*exp(sqrt(x)))/sqrt(x)
eq(x) = 
fplot(eq,[0 20])
  2 个评论
Md. Ashikur Rahman Any
Md. Ashikur Rahman Any 2021-4-18
If i want to get all the intersecting point of x axis for a particular range like the graph below.For instance here the intersecting ponit is in range of 1 to 400.
how to get that ?
Thanks in Advance
Cris LaPierre
Cris LaPierre 2021-4-18
Ran in:
I think you want to use vpasolve. It does not appear to be able to return all solutions at once, so you'll have to define intervals to search in. See this example.
syms x
eq = (sin(sqrt(x)+1)*exp(sqrt(x)))/sqrt(x)==0
eq = 
vpasolve(eq,x)
ans = 
70.976883688265468138734558699208
% restricting range
vpasolve(eq,x,[0 10])
ans = 
4.5864190939097721419092042333171
vpasolve(eq,x,[10 30])
ans = 
27.912046989998261521487390466387

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