'Help! I need a list, not a pointer to it'

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List:       python-list
Subject:    Help! I need a list, not a pointer to it
From:       Sorin Schwimmer <sxn02 () yahoo ! com>
Date:       2006-11-21 22:53:04
Message-ID: 20061121225304.67695.qmail () web56001 ! mail ! re3 ! yahoo ! com
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Hi All,

The following code:

<code>
r=3
c=1
solutions=[]
matrix=[[1.0], [0], [0]]
j=0
while j<c:
  i=0
  j=0
  more=True
  while more:
    while not matrix[i][j]:
      i+=1
    i+=1
    if i==r:
      matrix[0][j]=matrix[i-1][j]
      matrix[i-1][j]=0
      i=0
      j+=1
      if j==c: more=False
    else:
      matrix[i][j]=matrix[i-1][j]
      matrix[i-1][j]=0
      more=False
  print matrix
  solutions.append(matrix) # same result with matrix[:]
print solutions
</code>

gives:
[[0], [1.0], [0]]
[[0], [0], [1.0]]
[[1.0], [0], [0]]
[[[1.0], [0], [0]], [[1.0], [0], [0]], [[1.0], [0], [0]]]
(i.e. the last value of matrix, three times)

How can I end up with:
[[0], [1.0], [0]]
[[0], [0], [1.0]]
[[1.0], [0], [0]]
[[[0], [1.0], [0]], [[0], [0], [1.0]], [[1.0], [0], [0]]]
(i.e. each value of matrix)?

I'm on Python 2.4.1, under Linux.

Thanks,
Sorin

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[Attachment #5 (text/html)]

<html><head><style type="text/css"><!-- DIV {margin:0px;} \
--></style></head><body><div style="font-family:times new roman, new york, times, \
serif;font-size:12pt"><div>Hi All,<br><br>The following \
code:<br><br>&lt;code&gt;<br>r=3<br>c=1<br>solutions=[]<br>matrix=[[1.0], [0], \
[0]]<br>j=0<br>while j&lt;c:<br>&nbsp; i=0<br>&nbsp; j=0<br>&nbsp; \
more=True<br>&nbsp; while more:<br>&nbsp;&nbsp;&nbsp; while not \
matrix[i][j]:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; i+=1<br>&nbsp;&nbsp;&nbsp; \
i+=1<br>&nbsp;&nbsp;&nbsp; if i==r:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
matrix[0][j]=matrix[i-1][j]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
matrix[i-1][j]=0<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
i=0<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; j+=1<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; if j==c: \
more=False<br>&nbsp;&nbsp;&nbsp; else:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
matrix[i][j]=matrix[i-1][j]<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; \
matrix[i-1][j]=0<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; more=False<br>&nbsp; print \
matrix<br>&nbsp;  solutions.append(matrix) # same result with matrix[:]<br>print \
solutions<br>&lt;/code&gt;<br><br>gives:<br>[[0], [1.0], [0]]<br>[[0], [0], \
[1.0]]<br>[[1.0], [0], [0]]<br>[[[1.0], [0], [0]], [[1.0], [0], [0]], [[1.0], [0], \
[0]]]<br>(i.e. the last value of matrix, three times)<br><br>How can I end up \
with:<br>[[0], [1.0], [0]]<br>[[0], [0], [1.0]]<br>[[1.0], [0], [0]]<br>[[[0], [1.0], \
[0]], [[0], [0], [1.0]], [[1.0], [0], [0]]]<br>(i.e. each value of \
matrix)?<br><br>I'm on Python 2.4.1, under \
Linux.<br><br>Thanks,<br>Sorin<br></div></div><br>

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