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beginner1-Visitor
1-Visitor
February 8, 2018
Solved

INTEGRATION MYSTERY

  • February 8, 2018
  • 1 reply
  • 2007 views

Hi everybody!

what happen with my integration?.

I generated a function f(y) and integrated it in it's step and the value match with the simply calculation. But when I integrated the function from begin to end in one step, the integrate shows a wrong value. The function plot is clear!

 

Is this a mystery?

 

Thank you everybody

Best answer by Fred_Kohlhepp

You're seeing a symptom of tolerance in calculation. 

 

Go to the calculation tab and change TOL from 10^-3 to 10^-7

1 reply

F
Fred_Kohlhepp23-Emerald IAnswer
23-Emerald I
February 8, 2018

You're seeing a symptom of tolerance in calculation. 

 

Go to the calculation tab and change TOL from 10^-3 to 10^-7

B
beginner1-VisitorAuthor
1-Visitor
February 8, 2018

Thank you FredKohlhepp

 

you are right. Changing TOL to 10^-7 the problem was solved.

Would be useful if the software notice you about this type of difference.

 

Thank you

 

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
February 8, 2018
wrote:

Would be useful if the software notice you about this type of difference

 

Mathcad is a tool.  Like any tool it has things it does well, and limitations.  We all need to learn to use our tools correctly.

 

How would the software know that this problem existed?  It gave you an answer correct within the tolerance you specified.

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