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# find condition number helppp!!

A = ( 101 99 ) B=(101 99)

99 101 -99 101

Find cond(infinity)(A) and cond(infinity)(B)

(A and B are 2x2 matrices)

1). 點樣計 ||A||(infinite) = 200? (largest eigenvalue of A)?

2). ||A-1||(infinite = 0.5 點樣計出黎架?

thanks a lot for your answer!

你用圖整出黎好清楚亦都好比心機:D

### 1 Answer

- 自由自在Lv 710 years agoFavorite Answer
http://img27.imageshack.us/img27/1235/14868194.png

圖片參考：http://img27.imageshack.us/img27/1235/14868194.png

2011-01-22 19:23:09 補充：

The infinity norm is obtained:

1. For each row add up the absolute values of the entries

2. Determine the maximum of the values obtained

For A, for the first row, the sum is 101+99=200

The same for second row, so the infinity norm = 200

2011-01-22 19:23:18 補充：

For A^-1, first row 0.2525+0.2475 = 0.5

Same for second row, so infinity norm = 0.5