Solved: Mathcad 15- How can I get custom units to work?

rmarshall · ‎Jan 23, 2012

I am new to mathcad. As I understand the instructions, custom units should work with in a worksheet. The following entries do not work.

I will appreciate any help I can get.

Ron Marshall

RichardJ · ‎Jan 23, 2012

You have two typographical problems. First, immediately in front of the 10 is a space. I don't know how you got that, but it means Mathcad thinks <space>10 is a variable. The second one is really bizarre. I can't even figure out how to create it. Select the kg with the insertion point to the right. then delete the kg by backspacing, and finally delete the multiplication operator. You will see that the entire expression is surrounded by parentheses: (amu:=1.66053886*10^27). So somehow it's grouped the LHS and the RHS. I don't know how to do that even if I wanted to . It must be the result of some sequence of edits you did, probably involving the "1" that was originally on the LHS.

The solution is just to delete the entire expression and retype it.

View solution in original post

MikeArmstrong · ‎Jan 23, 2012

Try this.

Mike

RichardJ · ‎Jan 23, 2012

As Mike syas, get rid of the 1 on the LHS of the assignment. That is not allowed.

rmarshall · ‎Jan 23, 2012

Thanks for the suggestions. I have tried several variations. I retried removing the 1, but Mathcad will not recognize amu as a unit so far.

MikeArmstrong · ‎Jan 23, 2012

It will, look at my example posted above. That was created in M15.

Mike

RichardJ · ‎Jan 23, 2012

Please post a worksheet (to do this, click on "advanced editor" at the top right of the edit dialogue) showing the problem. We need that to figure out where your problem lies.

rmarshall · ‎Jan 23, 2012

I have attached the worksheet as an xmcd file.

Ron Marshall

wayne · ‎Jan 23, 2012

You typed something incorrectly when you entered (or modified) the RHS for amu, just re-type the definition.

RichardJ · ‎Jan 23, 2012

You have two typographical problems. First, immediately in front of the 10 is a space. I don't know how you got that, but it means Mathcad thinks <space>10 is a variable. The second one is really bizarre. I can't even figure out how to create it. Select the kg with the insertion point to the right. then delete the kg by backspacing, and finally delete the multiplication operator. You will see that the entire expression is surrounded by parentheses: (amu:=1.66053886*10^27). So somehow it's grouped the LHS and the RHS. I don't know how to do that even if I wanted to . It must be the result of some sequence of edits you did, probably involving the "1" that was originally on the LHS.

The solution is just to delete the entire expression and retype it.

rmarshall · ‎Jan 23, 2012

I have been copying and pasting numbers. I have noticed when I type in a whole line things seem to work the first time, what looks like straight foward editing seems to lead to problems. Your solution worked. Thanks to both of you.

Ron Marshall

RichardJ · ‎Jan 23, 2012

When you select something be careful what you are selecting. Watch that blue line

ValeryOchkov · ‎Jan 23, 2012

The amu is a built-in unit (constant) in Mathcad Prime: