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I am trying to integrate a function which has a parameter u.

Here is the code I have written

Integrate[((Sin[x] - Sinh[x] - 
     1.36222*(Cos[x] - 
        Cosh[x]))/(1 - (Sin[x] - Sinh[x] - 
         1.36222*(Cos[x] - Cosh[x]))*u)^2), {x, 0, 1}]

Its not working.

Is there any other way say numerically to solve this

(Note that u(t) function of t and I am integrating with respect to x, so I don't have the information of its value, at the most I can say is its real)

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1 Answer 1

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You can solve your problem using NIntegrate

f[u_?NumericQ] :=NIntegrate[((Sin[x] - Sinh[x] -1.36222*(Cos[x] -Cosh[x]))/(1- (Sin[x] - Sinh[x] -1.36222*(Cos[x] - Cosh[x]))*u)^2), {x, 0, 1}]

thereby parameter u is assumed to be const[x].

 Plot[f[u], {u, 0, 1}]

enter image description here

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  • $\begingroup$ I am trying to used this f[u] as an expression for ODE of u , so is there any way to have an explicit expression of f[u] ? $\endgroup$
    – T S Singh
    Commented Sep 5, 2018 at 5:51
  • $\begingroup$ @T S Singh It is an explicit expression, which can be used in NDSolve. $\endgroup$
    – Ulrich Neumann
    Commented Sep 5, 2018 at 6:35

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