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/sci/ - Science & Math

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2792224 No.2792224 [Reply] [Original]

in matrices, what does it mean to add for example:

5I_2 to another matrix?
(5 times I subscript 2)

Thanks!

>> No.2792234

Not exactly sure what you are asking...

http://en.wikipedia.org/wiki/Matrix_addition

>> No.2792240

i know how to add and all that! but in this question on my homework its telling me to multiply two matrixes, then to add the matrix "i" that has a coefficient and a subscript; i'm not sure what it's telling me to do on the latter.

>> No.2792269

i is referring to identity matrix I assume

>> No.2792304

I imagine 5I_2 refers to the identity matrix with size 2 multiplied by the scalar 5 or:
(5,0
0, 5)