fix doc in matrix

source/_static/code/matrix.py

@@ -91,18 +91,14 @@ def to_str(matrix):
 	# by design all matrix cols have same size
 	for row in zip(*matrix):
 		cells = [str(cell) for cell in row]
-		s += " ".join(cells) + "\n"
+		s += "\t".join(cells) + "\n"
 	return s
 
 
 def mult(matrix, val):
 	"""
-	:param matrix: the matrix to compute the size
+	:param matrix: the matrix
 	:type matrix: matrix
-	:param rows_no: the number of rows
-	:type rows_no: int
-	:param col_no: the number of columns
-	:type col_no: int
 	:param val: the value to mult the matrix with
 	:type val: int
 	:return: a new matrix corresponding the scalar product of matrix * val
@@ -115,6 +111,21 @@ def mult(matrix, val):
 	return new_matrix
 
 
+def mult_inplace(matrix, val):
+	"""
+	compute the scalar product of a matrix and a value
+	do this operation in place
+
+	:param matrix: the matrix
+	:type matrix: matrix
+	:param val: the value to mult the matrix with
+	:type val: int
+	"""
+	for col in matrix:
+		for row_nb, cell in enumerate(col):
+			col[row_nb] = cell * val
+
+
 def get_row(matrix, row_no):
 	"""
 	:param matrix: the matrix to compute the size
@@ -221,8 +232,7 @@ def replace_row(matrix, row_no, row):
 	for col_no, value in enumerate(row):
 		set_cell(matrix, row_no, col_no, value)
 
-		
-	
+
 if __name__ == '__main__':
 	m = create(5, 3)
 	print(m)
@@ -233,4 +243,7 @@ if __name__ == '__main__':
 	print(to_str(m))
 	print("get row 0",  get_row(m, 0))
 	print("get col 0", get_col(m, 0))
-	
+
+	m2 = create(3, 2, 4)
+	mult_inplace(m2, 2)
+	print(to_str(m2))