Hi all,
We're trying to find a way to get sage to generate latex
representation of numeric expressions without fully evaluating them.
For example this would allow us to do something like render 1+5 in
latex as $1+5$ instead of 6.
Can someone tell us if it's possible to achieve this goal ? Maybe by
doing something like
var('a')
var('b')
sage_exp("a + b", locals={'a': 1, 'b': 5})
This may require adding new code.
I prefer to discuss design upfront. I am new to the project.
I've been looking a bit at the sage.symbolic.expression class.
Pointers appreciated.
Cheers,
Jerome
Our background:
*******************
We've been experimenting with an exercise generator for math students.
Target age: <=18 years old at start.
Our first version of the program uses a custom language and a ply (lex/
yacc) parser. Our exercises are dynamic with some randomness for both
variables and operations. Example of an exercise:
id0
"Compute"
a (1;5)
b (-5;-1)
s \sign1
solve a s (b)
solution \res {a s (b)}
(add or substract 2 numbers)
or
id21
"Write the answer in standardform"
a, c, e, g \d(1;10)
b, d, f, h (-4;4)\0
solve \frac {\res {\decform{a*10^b}} * \res {\decform {c*10^d}}}{\res
{\decform{e*10^f}} * \res {\decform{g*10^h}}}
solution \stdform {\res {\frac {\res {a*10^b} * \res {c*10^d}}{\res
{e*10^f} * \res {g*10^h}}}}
For our second prototype, we've been exploring alternative designs, in
particular using Domain Specific Languages instead of a parser. Here
comes sage.
Sage seems great for everything that is advanced maths. But is harder
to use when it comes to simple numeric expressions. As the expressions
are evaluated right away, I am unable to render 1+5 in latex. It gets
printed as 6 instead of $1+5$
Other example: 2/4 + 1/4 should be $\frac{2}{4} + \frac{1}{4}$ and not
$\frac{1}{2} + \frac{1}{4}
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