# Singular

#### D.11.4.4 exp2pt

Procedure from library `findifs.lib` (see findifs_lib).

Usage:
exp2pt(P[,L]); P poly, L an optional list of strings

Return:
string

Purpose:
convert a polynomial M into the TeX format, in nodal form

Assume:
coefficients must not be fractional

Note:
an optional list L contains a string, which will replace the default value 'u' for the discretized function

Example:
 ```LIB "findifs.lib"; " EXAMPLE:"; ==> EXAMPLE: ring r = (0,dh,dt),(Tx,Tt),dp; poly M = (4*dh*Tx^2+1)*(Tt-1)^2; print(exp2pt(M)); ==> 4\tri h u^{n+2}_{j+2}+(-8\tri h) u^{n+1}_{j+2}+4\tri h u^{n}_{j+2}+u^{n+2\ }_{j}+(-2) u^{n+1}_{j}+u^{n}_{j} print(exp2pt(M,"F")); ==> 4\tri h F^{n+2}_{j+2}+(-8\tri h) F^{n+1}_{j+2}+4\tri h F^{n}_{j+2}+F^{n+2\ }_{j}+(-2) F^{n+1}_{j}+F^{n}_{j} ```