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polarnaut10-Marble
10-Marble
June 9, 2011
Question

Mathcad Prime Giving Wrong Answers

  • June 9, 2011
  • 3 replies
  • 4579 views

When I use the equals sign at the end of the equation to show the answer, sometimes if I alter the equation, the answer doesn't get updated leaving a wrong answer which gets carried through all of the calculations. See the attached PDF as an example. 0.94 + .74 = 1.68, not 1.59 as shown. Is there a fix for this? Note: This doesn't seem to be a problem when the results are shown seperately in another math region.

3 replies

V
24-Ruby III
VladimirN24-Ruby III
24-Ruby III
June 10, 2011

Hello!

Could you upload your Mathcad file (.mcdx)?

F
Fred_Kohlhepp23-Emerald I
23-Emerald I
June 10, 2011

Brett Meyring wrote:

When I use the equals sign at the end of the equation to show the answer, sometimes if I alter the equation, the answer doesn't get updated leaving a wrong answer which gets carried through all of the calculations. See the attached PDF as an example. 0.94 + .74 = 1.68, not 1.59 as shown. Is there a fix for this? Note: This doesn't seem to be a problem when the results are shown seperately in another math region.

Simply assigning numbers (with units) to variables I cannot recreate the problem.

J
Joeboy1-Visitor
1-Visitor
June 14, 2011

I use Mathcad 14 and this is a common problem

J
Joeboy1-Visitor
1-Visitor
June 14, 2011

In the attached file go to the comment in red, in the line below change d, initially the value of ne would not change, other values did. Once I saved the file and reopened it ne was evaluated properly. The problem does not occur in any consistent fashion. When I use the = evaluation at the end of an expression I reevalaute it if I change inputs.

V
24-Ruby III
VladimirN24-Ruby III
24-Ruby III
June 14, 2011

I have changed value for "d" on d=0,7 [m] in two places in document Mathcad and in both cases value for "ne" became equal ne=0.035 [s/m^0.333].

The given changes spent in Mathcad 15.

Var_change.GIF

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