how to store the result of each iteration of for loop into an array in python

Question

d1=[[0],[1]]
fnet1=[[-0.8420],[-0.8841]]

for i in range(len(d1)):
    s=(d1[i]-fnet1[i])
    print "s:",s
    t=(1-np.power(fnet1[i],2))
    print "t:",t
    m=np.dot(s,t)
    deltaO=np.dot((0.5),m)
    print "deltaO:",deltaO

I expect answer like deltaO=[[0.1225],[0.2057]] but I am getting the answer in different form like deltaO=[[0.1225]] and deltaO=[[0.2057]] if I use print deltaO. But I want both answers in one matrix. In this print "deltaO:",deltaO, statement in the for loop show only one value.

Your example code dos not work: TypeError: unsupported operand type(s) for -: 'list' and 'list'. Please provide working code. — Mike Müller
– Mike Müller, Commented Jan 4, 2016 at 5:53

cwahls · Accepted Answer · 2016-01-04 06:24:57Z

1

Before the for statement, define deltaO as an empty list (matrix). Change the other deltaO line (ln10) to deltaO.append(np.dot((0.5),m)), and the next to print "deltaO:",deltaO[-1].

It should print the most recent entry and keep the others.

edited Jan 4, 2016 at 6:24

answered Jan 4, 2016 at 6:18

cwahls

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