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From: | ロ コクユウ |
Subject: | [Help-glpk] Got a wrong order of column by lpx_get_mat_row(lp, j, ndx, val)? |
Date: | Wed, 19 Jan 2005 10:52:04 +0900 |
Dose anyone meet this problem:
for example in jth row :
a*x-y+b*z=0;
by len=lpx_get_mat_row(lp, j, ndx, val), I found
val=[-1,a,b], that mean the order of column is y,x,z.
I added two new columns to this row like:
ndx[len+1]=w, ndx[len+2]=v, val[len+1]=d,
val[len+2]=e, len+=2
lpx_set_mat_row(lp,j,len,ndx,val)
then I thought the jth row should be
a*x-y+b*z+d*w+e*v=0, but when I tried len=lpx_get_mat_row(lp, j, ndx, val)
again,
I found it's d*w+e*v+a*x-y+b*z=0.
I wonder whether the order of columns in row is
fixed and how the order of columns in a row is arranged there.
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