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add one check for matrix index #149

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Jan 30, 2024
Merged

add one check for matrix index #149

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5 changes: 4 additions & 1 deletion cypari2/gen.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -1522,14 +1522,17 @@ cdef class Gen(Gen_base):
if typ(self.g) != t_MAT:
raise TypeError("cannot index PARI type %s by tuple" % typ(self.g))

if len(n) != 2:
raise ValueError("matrix index must be [row, column]")

i, j = n

if i < 0 or i >= glength(gel(self.g, 1)):
raise IndexError("row i(=%s) must be between 0 and %s" % (i, self.nrows()-1))
if j < 0 or j >= glength(self.g):
raise IndexError("column j(=%s) must be between 0 and %s" % (j, self.ncols()-1))

self.cache((i,j), x)
self.cache((i, j), x)
xt = x.ref_target()
set_gcoeff(self.g, i+1, j+1, xt)
return
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