travail

matrice.py

+class matrice():
+
+    def __init__(self,l,_format=None):
+        self.liste=l
+        a=len(l[0])
+        if not _format:
+            for i in l:
+                if len(i)!=a:
+                    raise ValueError('All lines do not share same length')
+            self.format=(len(l),a)
+        else:
+            self.format=_format
+
+    def __repr__(self):
+        l=self.liste
+        lr=[]
+        for i in l:
+            ch='['
+            for j in i:
+                ch=ch+' {} '.format(j)
+            lr.append(ch+']')
+        return('\n'.join(lr))
+
+    def __add__(self,other):
+        if not isinstance(other,matrice):
+            raise TypeError("other(={}) n'est pas une matrice")
+        l1=self.liste
+        l2=other.liste
+        if not self.format==other.format:
+            raise ValueError('matrices do not share the same format')
+        n,m=self.format
+        l=[[l1[i][j]+l2[i][j] for j in range(m)] for i in range(n)]
+        return(matrice(l,(n,m)))
+
+    def __mul__(self,other):
+        if not isinstance(other,matrice):
+            raise TypeError("other(={}) n'est pas une matrice")
+        l1=self.liste
+        l2=other.liste
+        if not self.format[1]==other.format[0]:
+            raise ValueError("matrices are not of formats compatible for matrice multiplication")
+        n,k=self.format
+        k1,m=other.format
+        l=[[sum(l1[i][l]*l2[l][j] for l in range(k)) for j in range(m)] for
+                i in range(n)]
+        return(matrice(l,(n,m)))
+
+

matrix.py

@@ -6,13 +6,38 @@ class Matrice:
         self._nrows = nrows
 
     def __repr__(self):
-        raise NotImplementedError
+        l=self.liste
+        lr=[]
+        for i in l:
+            ch='['
+            for j in i:
+                ch=ch+' {} '.format(j)
+            lr.append(ch+']')
+        return('\n'.join(lr))
 
     def __add__(self, other):
-        raise NotImplementedError
+        if not isinstance(other,matrice):
+            raise TypeError("other(={}) n'est pas une matrice")
+        l1=self.liste
+        l2=other.liste
+        if not self.format==other.format:
+            raise ValueError('matrices do not share the same format')
+        n,m=self._nrows,self._ncols
+        l=[[l1[i][j]+l2[i][j] for j in range(m)] for i in range(n)]
+        return(matrice(m,n,l))
 
     def __mul__(self, other):
-        raise NotImplementedError
+        if not isinstance(other,matrice):
+            raise TypeError("other(={}) n'est pas une matrice")
+        l1=self.liste
+        l2=other.liste
+        if not self._ncols==other._nrows:
+            raise ValueError("matrices are not of formats compatible for matrice multiplication")
+        n,k=self._nrows,self._ncols
+        k1,m=other._nrows,other._ncols
+        l=[[sum(l1[i][l]*l2[l][j] for l in range(k)) for j in range(m)] for
+                i in range(n)]
+        return(matrice(m,n,l))
 
     def nombre_de_colonnes(self, other):
         raise NotImplementedError