Hello,
here is a tiny patch to generalize Matrix.subs() with a working test.
diff -r 55980b35927e sympy/matrices/matrices.py
--- a/sympy/matrices/matrices.py Sat Jun 14 21:09:27 2008 +0200
+++ b/sympy/matrices/matrices.py Sun Jun 15 18:44:16 2008 +0200
@@ -251,9 +251,9 @@
out[:,:] = Matrix(self.lines, self.cols, lambda i,j:
self[i,j].combine())
return out
- def subs(self,a,b):
+ def subs(self, *args):
out = self[:,:]
- out[:,:] = Matrix(self.lines, self.cols, lambda i,j:
self[i,j].subs(a,b))
+ out[:,:] = Matrix(self.lines, self.cols, lambda i,j:
self[i,j].subs(*args))
return out
def __sub__(self,a):
diff -r 55980b35927e sympy/matrices/tests/test_matrices.py
--- a/sympy/matrices/tests/test_matrices.py Sat Jun 14 21:09:27
2008 +0200
+++ b/sympy/matrices/tests/test_matrices.py Sun Jun 15 18:44:16
2008 +0200
@@ -712,6 +712,10 @@
def test_subs():
x = Symbol('x')
assert Matrix([[1,x],[x,4]]).subs(x, 5) == Matrix([[1,5],[5,4]])
+ y = Symbol('y')
+ assert Matrix([[x,2],[x+y,4]]).subs([[x,-1],[y,-2]]) ==
Matrix([[-1,2],[-3,4]])
+ assert Matrix([[x,2],[x+y,4]]).subs([(x,-1),(y,-2)]) ==
Matrix([[-1,2],[-3,4]])
+ assert Matrix([[x,2],[x+y,4]]).subs({x:-1,y:-2}) ==
Matrix([[-1,2],[-3,4]])
def test_conjugate():
Now we can use also _subs_dict, and _subs_list with matrices.
Thank you for sympy
Riccardo Gori
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