# week07 - Math 43 Fall 2007 B Dodson Week 7 Graded Homework...

This preview shows pages 1–2. Sign up to view the full content.

Math 43, Fall 2007 B. Dodson Week 7: Graded Homework 7: 3.1 - 14; 3.2 - 24; 3.3 - 2. due Mon. Oct. 22 Suggested Homework 7: graded Homework plus 3.1 - 3, 4, 5, 15, 23, 35; 3.2 - 1, 2, 23; 3.3 - 3, 11, 35 due Wed. Oct. 24. Seventh week. Matrix Arithmetic; Algebra; Inverses If A and B are both m -by- n -matricies, with A = [ a i,j ] and B = [ b i,j ] the matrix sum C = A + B is the matrix C = [ c i,j ] with i, j -th entry c i,j = a i,j + b i,j . We also have scalar multiplication rA, which has i, j -th entry ra i,j . For matrix multiplication, multiplying two matricies, we start with row-matrix × column-matrix by [ r 1 , r 2 , . . . , r n ] × c 1 c 2 . . . c n = r 1 c 1 + r 2 c 2 + ··· + r n c n . For example [2 , - 1] 3 2 - 1 = . . . and [2 , - 1 , 5] 3 2 - 1 = . . . Finally, if A has rows ± R 1 . . . ± R s and B has columns B = [ ± C 1 , . . . , ± C u ] we set AB = A [ ± C 1 , . . . , ± C u ] = [ A ± C 1 , . . . , A ± C u ] which is the matrix with entries ± R i ± C j , .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 3

week07 - Math 43 Fall 2007 B Dodson Week 7 Graded Homework...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online