Solve Equation with No Analytic Solution - Symbolic Integration

[dabo]

I would like to solve an equation:
NIntegrate[f[x],{x,a,b}]==1
For a and b, my function doesn't have analytic solution.

 

[Mark44]

I would like to solve an equation:
NIntegrate[f[x],{x,a,b}]==1
For a and b, my function doesn't have analytic solution.

It's not clear to me what you're trying to do. Are you trying to solve for a and b so that $\int_a^b f(x)dx = 1$?

 

[dabo]

It's not clear to me what you're trying to do. Are you trying to solve for a and b so that $\int_a^b f(x)dx = 1$?

Yes Mark, I want to find all the points a and b so that the integral takes the value 1 or another.

 

[Mark44]

Yes Mark, I want to find all the points a and b so that the integral takes the value 1 or another.

I doubt very much that this is possible. For a given function f, there could be an infinite number of (a, b) pairs of numbers for which $\int_a^b f(x)dx = 1$.

 

[dabo]

I have some constrictions both a and b must be positive and they are in some range.

 

[Mark44]

I have some constrictions both a and b must be positive and they are in some range.

I still think you're out of luck. As far as I know, NIntegrate is not implemented to do what you want it to do.

 

[Bill Simpson]

If all the code needed to define your f and describe your conditions on a and b is fairly small and the text of that code can be pasted into a message then someone might scrape that code, paste it into Mathematica and spend a little time seeing what they could do with it. If you can provide any more information about what you want to do with the answer or what form you need the result in then that might help increase your chances of getting something worthwhile in return. Screen captures or incomplete descriptions almost certainly won't get anything useful.