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Topic: problems integrating a function
Replies: 5   Last Post: Jan 5, 2011 11:38 AM

 Messages: [ Previous | Next ]
 Marcio Barbalho Posts: 15 Registered: 6/2/10
problems integrating a function
Posted: Jan 4, 2011 8:29 PM

Could any of you find the numerical solution to the integral of sin[(x-pi)/sqrt(x)] from pi/100 to pi?

S = int(sin((x-pi)/sqrt(x)),x=pi/100..pi)

You may copy and paste there.
I have already tried both Matlab and Scilab.

From Matlab I get:
Warning: Explicit integral could not be found.
> In sym.int at 64
In char.int at 9
ans =
int(-sin(1/x^(1/2)*(pi - x)), x = pi/100..pi)

From scilab (I installed scilab just to integrate this function):
-->integrate('sin((x-%pi)/sqrt(x))','x',0,%pi)
!--error 24
Convergence problem...
at line 70 of function integrate called by :
integrate('sin((x-%pi)/sqrt(x))','x',0,%pi)

The solution is -1.295820

I just can't get Matlab to find it.

Many thanks

Date Subject Author
1/4/11 Marcio Barbalho
1/4/11 Oleg Komarov
1/4/11 proecsm
1/5/11 Walter Roberson
1/5/11 Greg von Winckel
1/5/11 Greg von Winckel