How to get textbook display of an expression held in a string?

[BruceH]

I have a piece of code that generates an expression as a string. I can't find a way to convert it into a CAS expression (within the program and without simplifying or evaluating it) so that it displays pretty-printed in textbook mode on the history stack when the program ends.

Typical example is: "3 NTHROOT (1/8)" which I'd like to see displayed as:
\begin{equation}
\sqrt[3]{1/8}
\end{equation}

Any suggestions, please?

[Didier Lachieze]

If s is your string, then the following should work:

Code:

EXPR("'" + s + "'")

or

Code:

EXPR("QUOTE(" + s + ")")

[BruceH]

Thanks, the latter version did the trick. I felt sure that I had tried every combination of QUOTE, EXPR and EVAL but clearly not. Thanks again.

[Didier Lachieze]

Both versions work in the tests I've done. Do you have an example where the first one would not work ?