translating equation to mathcad prime

Use an "else" instead of "otherwise".

It would look like this:

Some remarks:

• You may omit Xi and use the calculated expression directly in the comparison
• function argument etao is neverused, so it could be omitted
• the assignment to a local(!) variable p in the last line is not necessary and useless

So it could also be written as

And if you like you may also use the if-function instead

And because program execution exits after a "return" statement, you may also write

One more option:

If you have the (original) mathcad ( .mcd or .xmcd) file that contains the function, then use Prime's built in converter to translate it to Prime.

Success!
Luc