 
 
 
2.21.23  Rewrite an expression with different options : convert convertir
convert takes two arguments an expression and an option.
convert rewrites this expression applying rules depending 
on the option. Valid options are :
- 
sin converts an expression like trigsin.
- cos converts an expression liketrigcos.
- sincos converts an expression like sincos.
- trig converts an expression like sincos.
- tan converts an expression like halftan.
- exp converts an expression like trig2exp.
- ln converts an expression like trig2exp.
- expln converts an expression like trig2exp.
- string converts an expression into a string.
- matrix converts a list of lists into a matrix.
- polynom converts a Taylor series into a un polynomial 
by removing the remainder (cf 2.24.22).
- parfrac or partfrac or fullparfrac converts a rational 
fraction into it’s partial fraction decomposition (2.28.9).
convert can also :
- 
convert units, for example 
convert(1000_g,_kg)=1.0_kg (cf 5.1.4).
- write a real as a continued fraction : 
convert(a,confrac,’fc’) writes a as a continued fraction
stored in fc. Do not forget to quote the last argument if it
was assigned.
 For example, convert(1.2,confrac,’fc’)=[1,5] and fc contains the 
continue fraction équal to 1.2 (cf 2.8.7).
- transform an integer into the list of its ciphers in a 
basis, begining with the unit cipher (and reciprocally)
- 
convert(n,base,b) transforms the integer n into the list of its 
ciphers in a basis b begining with the unit cipher.
 For example,
convert(123,base,10)=[3,2,1] and reciproqualy
- convert(l,base,b) transforms the list l into the integer n 
which have l as list of its 
ciphers in a basis b begining with the unit cipher.
 For example, 
convert([3,2,1],base,10)=123 (cf 2.5).
 
 
 
