selenamalter
which product is undefined?
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selenamalter
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uri
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matrics?
selenamalter
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yeah
uri
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i don't get your question?
selenamalter
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A.
AB
B.
BA
C.
DB
D.
CD
would these help
uri
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wait so like you're asking me to slove all this and tell you from this which one's are impossibe?
uri
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solve*
selenamalter
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I think so :/
you see, the problem is, i dont know how to do it
amistre64
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matrix multiplication requires that the number of columns in the first one, matches the number of rows in the second one
uri
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Okay wait :3
amistre64
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|dw:1371047591398:dw|
selenamalter
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so? BD ???
amistre64
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does B have a different number of columns then D has rows?
amistre64
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essentially, we need to be able to pair up vectors|dw:1371047676408:dw|
if we cant pair up the vectors, we can perform the operations
giolefpatceid
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For each multiplication, count the number of columns for the first table and the number of rows for the second table. If they are equal, the multiplication is valid. Otherwise the product it is undefined.
uri
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It's BA.
uri
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Option no.B
amistre64
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if we notate this in row,column format
A=3,2
B=2,2
C=3,1
D=1,2
(r,c)(r,c)
| |
these numbers
have to equal
amistre64
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CD = 3,1 1,2 is valid
DB = 1,2 2,2 is valid
AB = 3,2 2,2 is valid
BB = 2,2 2,2 is valid
i think thats all the valid ones
giolefpatceid
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For the AB multiplication. A has 2 columns, B has 2 rows, so the multiplication is valid. You do the same thing for the rest.