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# Log of /trunk/pg/lib/Value/Real.pm

Revision 3992 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Jan 30 16:20:09 2006 UTC (13 years, 10 months ago) by dpvc
File length: 6122 byte(s)
Diff to previous 3716
```When checking for division by zero, don't do fuzzy check.
```

Revision 3716 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Oct 16 03:37:17 2005 UTC (14 years, 1 month ago) by dpvc
File length: 6111 byte(s)
Diff to previous 3596
```In the past, when Value objects were inserted into strings, they would
automatically include parentheses so that if you had \$f equal to 1+x
and \$g equal to 1-x, then Formula("\$f/\$g") would mean (1+x)/(1-x)
rather than 1+(x/1)-x, which is what would happen as a straing string
substitution.

The problem is that this would also happen for real numbers, vectors,
and everything else, even when it wasn't necessary.  So if \$x=Real(3),
then "Let x = \$x" would be "Let x = (3)".

I have changed the behavior of the string concatenation for Value
objects so that parentheses are only added in a few cases: for
Formulas, Complex numbers, and Unions.  This makes the other Value
objects work more like regular variables in strings, but might cause
some problems with strings that are used as formulas.  For example, if
\$a = Real(-3), then "x + 2 \$a" will become "x + 2 -3", or "x-1" rather
than the expected "x - 6".  (The old approach would have made it "x +
2 (-3)" which would have worked properly).  For the most part, it is
easier to use something like "x + 2*\$a" or even "x" + 2*\$a in this
case, so the extra trouble of having to avoid parentheses when you
really meant to substitute the value into a string didn't seem worth
it.
```

Revision 3596 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Fri Sep 2 22:29:59 2005 UTC (14 years, 3 months ago) by dpvc
File length: 6104 byte(s)
Diff to previous 3562
```Fixed error in atan2 where second argument was not promoted to a Real.
```

Revision 3562 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Wed Aug 24 19:07:10 2005 UTC (14 years, 3 months ago) by dpvc
File length: 6021 byte(s)
Diff to previous 3370
```Changed stringify to check for an answer that is zero by using the
zeroLevelTol value directly (rather than use the fuzzy equality check
for zero, which depends on the tolType in a bad way).
```

Revision 3370 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Jul 12 22:29:53 2005 UTC (14 years, 4 months ago) by dpvc
File length: 6014 byte(s)
Diff to previous 3341
```A first pass at making parser error messages localizable.  The
Context()->{error}{msg} hash can be used to specify translations of
the standard messages.  For example,

Context()->{error}{msg}{'Division by zero'} = "Don't divide by zero, dude!";
Context()->{error}{msg}{'Function '%s' has too many inputs'} =
"You passed too many arguments to '%s'";

(I didn't translate into another language, here, but you could do
that, too.)

The msg hash could also be used within answer checkers to make certain
```

Revision 3341 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Jul 4 15:43:53 2005 UTC (14 years, 5 months ago) by dpvc
File length: 6012 byte(s)
Diff to previous 3261
```Implement "remove trailing zeros" format, like in prfmt().  I still
think '%g' works better in most cases ('%f#' will print larger values
without using scientific notation, which is nice, but will print small
numbers like .000000005 as 0, even though the fuzzy comparison of this
to zero will not be true.)
```

Revision 3261 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Jun 4 13:50:41 2005 UTC (14 years, 6 months ago) by dpvc
File length: 5968 byte(s)
Diff to previous 3192
```Avoid possible infinite loop with length and typeref calls.
```

Revision 3192 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Wed Mar 16 13:30:28 2005 UTC (14 years, 8 months ago) by dpvc
File length: 5953 byte(s)
Diff to previous 3171
```Update the overloaded operators so that they can be overridden by
subclasses of the predefined object classes.  This involves calling
the objects method rather than using a hard reference to the routine
in the parent class.

Also, change the name of the string comparison routine to
compare_string to avoid conflicts with cmp that is used to produce the

Finally, in Value.pm, promotePrecedence no longer has to do fancy
footwork to get "special" precedence to work (this was a hack to get
around the misfeature of the overloaded operators -- now that that is
being handled correctly, there is no need for it).
```

Revision 3171 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Feb 15 21:53:23 2005 UTC (14 years, 9 months ago) by dpvc
File length: 5805 byte(s)
Diff to previous 3166
```Improved the Real(), Complex(), Point(), Vector(), Matrix() and
String() constructors so that they will process formulas passed to
them as strings rather than requiring perl objects for these.

For example, you can use Real("2/3") rather than Real(2/3) if you
want.  Also, Real("1+x") will return a formula returning a real
(essentially the same as Formula("1+x") in this case).
```

Revision 3166 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Feb 15 02:20:52 2005 UTC (14 years, 9 months ago) by dpvc
File length: 5654 byte(s)
Diff to previous 3165
```Fixed an error with Matrix() that could cause it to loop infinitely
when bad data is passed to it.

Also, allow Matrix(), Point(), Vector(), and Real() to accept string
values that are evaluated to produce the value returned.

(Sorry, accidentally committed with a blank message.)
```

Revision 3165 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Feb 15 02:16:10 2005 UTC (14 years, 9 months ago) by dpvc
File length: 5658 byte(s)
Diff to previous 2908
```*** empty log message ***
```

Revision 2908 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Tue Oct 12 20:46:43 2004 UTC (15 years, 1 month ago) by dpvc
File length: 5695 byte(s)
Diff to previous 2800
```Report errors for powers of negative numbers rather than return 'nan'.
Don't allow 'nan' to be made into a Real object.
```

Revision 2800 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sun Sep 19 14:27:39 2004 UTC (15 years, 2 months ago) by dpvc
File length: 5350 byte(s)
Diff to previous 2625
```Added isZero and isOne checks for Parser::Value objects (i.e., for
constants within formulas).  These now correctly handle vector and
matrices, in particular.  The isOne and isZero checks are used in the
reduce() method to simplify formulas.
```

Revision 2625 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Mon Aug 16 18:35:12 2004 UTC (15 years, 3 months ago) by dpvc
File length: 5297 byte(s)
Diff to previous 2615
```Added string comparison to all Value object classes (to compare the
string value of an object to another string).

Overloaded perl '.' operator to do dot product when the operands are
formulas returning vectors.  (Part of the auto-generation of
formulas).

A few improvements to real and complex class output results.

Made Union class slightly more robust and removed need for makeUnion
method other than in the Union itself.
```

Revision 2615 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Aug 14 21:27:45 2004 UTC (15 years, 3 months ago) by dpvc
File length: 5267 byte(s)
Diff to previous 2612
```*** empty log message ***
```

Revision 2612 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Aug 14 19:29:42 2004 UTC (15 years, 3 months ago) by dpvc
File length: 5364 byte(s)
Diff to previous 2606
```Fixed some bugs in the handle of the context in ->string and ->TeX
methods of Value objects.
```

Revision 2606 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Sat Aug 14 11:25:47 2004 UTC (15 years, 3 months ago) by dpvc
File length: 5328 byte(s)
Diff to previous 2603
```Can now specify that the objects stringify themselfs in their TeX
forms rather than their answer-string forms.  This makes it easier to
use the objects in the text of a problem (without having to call ->TeX
explicitly each reference).

Use

Context()->texStrings

to start outputting TeX strings, and

Context()->normalStrings

to switch back.
```

Revision 2603 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Fri Aug 13 23:01:07 2004 UTC (15 years, 3 months ago) by dpvc
File length: 5352 byte(s)
Diff to previous 2597
```Added an Infinite object class for the Value package.  Still need to
add it to the Parser package.
```

Revision 2597 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Fri Aug 13 11:38:22 2004 UTC (15 years, 3 months ago) by dpvc
File length: 5292 byte(s)
Diff to previous 2592
```Added answer checker for parallel vectors.
Added option to number checker to have it not report type mismatches
for the known strings (like 'infinity').  (Really need a class for
infinities, and a Value.pm class for strings.)
```

Revision 2592 - (view) (download) (as text) (annotate) - [select for diffs]
Modified Thu Aug 12 16:40:47 2004 UTC (15 years, 3 months ago) by dpvc
File length: 5230 byte(s)
Diff to previous 2580
```A number of small fixes.  Most were to fix minor bugs in string and
TeX output, particulary for the various list-based objects (like
vectors, intervals, etc.).  There were also some bug fixes in the
intervals when the coordinates are formulas.
```

Revision 2580 - (view) (download) (as text) (annotate) - [select for diffs]
Added Mon Aug 9 21:38:58 2004 UTC (15 years, 4 months ago) by dpvc
File length: 5168 byte(s)
```Forgot to add this file.  It implements the "fuzzy real" class.
```

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