8-Gravel

Question

Loop program

Forum|Forum|4 years ago
July 18, 2022
9 replies
3286 views

The problem is the R loop solve 2 instead of 1 and the Vx loop solve 2 instead of 3. What’s the problem?

1_TEST.zip

P

ppal_255687

18-Opal

Don't know why the units cause problems.

See if this helps https://community.ptc.com/t5/Mathcad/Using-Units-in-a-for-loop/m-p/84351

W

Werner_E

25-Diamond I

When you learn programming than one of the first things you learn is that you should never compare float values for equality but rather ask if the absolut value of their difference is smaller than a certain small value like 10^-10.

The use of the units results in very small floating point rounding/conversion errors and so (l-b) is not exactly equal to x.

You may do it that way:

Or define a function

BTW, your programs don't contain any loops (no "if" and no "while").

A

AS_9781967

Author

8-Gravel

Thank you for your input. Is it possible to use different calculation formulae depending on x value

If x = (l-b); Matcad use formulae 1 to solve R

If 0 ≤ x < (l-b); Matcad use formulae 2 to solve R

If (l-b) < x ≤ l; Matcad use formulae 3 to solve R

For any other values of x, Matcad use 0 to solve R

If 0 ≤ x ≤ a; Matcad use formulae 1 to solve Vx

If a < x < (l-b); Matcad use formulae 2 to solve Vx

If (l-b) ≤ x ≤ l; Matcad use formulae 3 to solve Vx

For any other values of x, Matcad use 0 to solve Vx

W

Werner_E

25-Diamond I

@AS_9781967 wrote:

Thank you for your input. Is it possible to use different calculation formulae depending on x value

Sure. Simply replace "Result <-- 1" by "Result <-- <formulae 1>" etc.

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