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{SECT 0 {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 22 "restart; with(linalg
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and trace have been redefined and unprotected" }}}{EXCHG {PARA 0 "> " 
0 "" {MPLTEXT 1 0 14 "P:=matrix(1,2," }{MPLTEXT 1 0 62 "[1,r]); # line
ar polynomial for C0 2 node line element (L2_C0)" }}{PARA 11 "" 1 "" 
{XPPMATH 20 "=6\"6$;\"\"\"F&;F&\"\"#E\\[l#6$F&F(I\"rGF#6$F&F&F&" }}}
{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 54 "# unit coordinate system, 0 \+
<= r <= 1, x(r) = x1 + r*L" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 
51 "dx_dr:=L: dr_dx:=1/dx_dr: r_i:=[0,1]; # local nodes" }}{PARA 11 ""
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 1 0 31 "G:=matrix(2,2,[[1, 0],[1, 1]]);" }}{PARA 0 "> " 0 "" {MPLTEXT
 1 0 26 "G_inv:=evalm(inverse(G)); " }}{PARA 11 "" 1 "" {XPPMATH 20 "=
6\"6$;\"\"\"\"\"#F%E\\[l%6$F&F'\"\"!6$F'F'F&6$F'F&F&6$F&F&F&" }}{PARA 
11 "" 1 "" {XPPMATH 20 "=6\"6$;\"\"\"\"\"#F%E\\[l%6$F&F'\"\"!6$F'F'F&6
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nalg[multiply](P,G_inv); # shape functions" }}{PARA 11 "" 1 "" 
{XPPMATH 20 "=6\"6$;\"\"\"F&;F&\"\"#E\\[l#6$F&F(I\"rGF#6$F&F&,&F&F&F+!
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"> " 0 "" {MPLTEXT 1 0 49 "Load := map(int,transpose(N), r = 0..1)* dx
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 0 "" {MPLTEXT 1 0 54 "plot(\{seq(N[1,j],j=1..2)\},r=0..1,color=[red,b
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