________________________________ From: MARK BAKER <[email protected]> To: ""[email protected]"" <[email protected]> Sent: Sunday, July 15, 2012 9:12 AM Subject: simultaneous equations Hello, I have been trying to get a simultaneous equations done, yet I finding errors... in how im doing it Im trying to do this equation here A b 2x'1' + 4x'2' + 3x'3' = 4 x'1' - 2x'2' - 2x'3' = 0 -3x'1' + 3x'2' + 2x'3' = -7 this is the solution [2x'1' + 4x'2' + 3x'3'] [ 4] = [2] = x'1' (1/11) [x'1' - 2x'2' - 2x'3' ] [0] = [-3] = x'2' [-3x'1' + 3x'2' + 2x'3'] [-7] = [4] = x'3' How should i do this in PDL ??? I tried x = (A**-1)*b like this pdl> p $k = pdl([[2,1,-2],[4,13,7],[-3,-18,-8]]); [ [ 2 1 -2] [ 4 13 7] [ -3 -18 -8] ] pdl> p $j = pdl([[4],[0],[7]]); [ [4] [0] [7] ] so when I try to do the answer i get pdl> p ((1/11)*$k**-1)*$j; [ [ 0.045454545 0.090909091 -0.045454545] [ 0.022727273 0.006993007 0.012987013] [ -0.03030303 -0.0050505051 -0.011363636] ] can any one help me with what im doing wrong in PDL here ??? Thanks -Mark
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