CVS log for loncom/homework/lonmaxima.pm

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- Improve regexp used to convert pi to %pi in &maxima_cas_formula_fix().
  - Conversion if pi is at the beginning or at the end of the string.
  - Exclude conversion if pi is the first part of a variable name (e.g., pie).

- Use maxima to validate that submission is well-formed.

- Trailing double open parentheses are not allowed.

- Reverse changes in 1.31 through 1.34 using a regexp.
- The simplest solution is to use parentheses for the submission.

- Matching balanced parentheses is a false positive.

- Match additional patterns.

- Don't charge a try when detecting pattern added in rev. 1.31 at
  end of submission.
- Expand regexp to detect trailing double open parens.

- Pre-evaluation clean-up.

- Bug 6561.

Deal with pi->%pi

- The input number in %iN could be more than a single digit (i.e., N > 9).

allows imaginary unit (%i) to be used, but NOW ALSO disallows access to maximas input variables (such als %i1, %i2, ...)

blacklisting %i is not a good idea as it respresents the imaginary unit.
Current problems using %i in this semantics do not work anymore.
The other usage of %i is a reference to input lines. This should indeed be blocked if possible. However, it is unlikely that anybody uses it in this semantics.

Ordered maxima command blacklist alphabetically

Extended blacklist:
Added some commands to the not allowed maxima commands blacklist.
These commands are not needed, don't make sense in a problem and confuse the system,
e.g. display other values than expected, code ran too long error, etc.

Bug #5738: be able to load libraries into Maxima

Need to catch incorrect syntax in <formularesponse>, so students do not get
charged a try.

put reset on blacklist

I think the following maxima commands should be blacklisted:
inchar, outchar, ttyoff
They allow to manipulate maxima's prompts for input and output. However, &getmaximaoutput in lonmaxima (w/o .pm) relies and the defaults %i and %o, respectively.
with_stdout, writefile
allow file access

- revert 1.18
- add read to banned words

load is needed by authors if they need to load additional maxima packages

- document where the seemingly random digits come from

- need parentheses

- ban concat/sconcat
- addin debug display of communication

Only get rid of leading and trailing spaces, so the derivative of 3*sin(0.5*x) is not 15cos(05x)

- Make check for true or false case insensitive (maxima/clisp on SuSE returns upper case; maxima/gcl on Fedora returns lower case).
- regexp for false now /^\s*false\s*$/ (i.e., $ termination added - assuming there's no \n here). Should there be a chomp($reply)?

The reset()-command in MAXIMA is broken
Need to actually do string replacement

&cas()

<mathhint> functionality

Make formula fix work with <mathresponse>

More elegant

<mathresponse> appears to work, but needs lots of testing

Saving work for MAXIMA.

- moving code from modules into main

mathresponse successfully calls lonmaxima

Work on mathresponse

Ignore linebreaks

Routines to talk to MAXIMA CAS