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ValeryOchkov24-Ruby IV
24-Ruby IV
September 13, 2013
Question

Symbol Math and units in ...:=...=

  • September 13, 2013
  • 1 reply
  • 3100 views

Is it a bug?

Syb-A.png

1 reply

V
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
September 13, 2013

In Mathcad 15 all OK!

Syb-A-15.png

J
jkucan5-Regular Member
5-Regular Member
September 13, 2013

The reason is that symbolic engine does not know what 'rad' or 'm' or any other unit is. Specifically, PTC Mathcad tries to symbolically sin(Pi*rad) and sees 'rad' as undefined symbol and not 1. This is same in Prime 2.0 and 15.0:

Untitled.png

When you use :=...= expression, defining Untitled.pngis the same as definig Untitled.png. Similarly, defining Untitled.pngis the same as definign Untitled.png.

The latter is where 15.0 and Prime 2.0 differ. To see advantage of Prime 2.0, consider:

Untitled.png

Bottom line: :=...= is _not_ just a convenience for displaying values, but it affects semantics (of symbolic evaluation).

V
ValeryOchkov24-Ruby IVAuthor
24-Ruby IV
September 14, 2013

Thanks, Jakov. I understand it.

But the questin was why all ok is in MC15 and not ok in Pime - see my pictures above.

Again dynamic units?

...:=...=... and ...:=... ...=... must be equal.

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