another vecextract ( attempt to understand possibilities)

science_man_88 May 27th, 2017 138 Never
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  1. my(c=vector(300,i,x^i),a=Vec("30..60"),b=[]);a[1]=concat("[",a[1]);a[#a]=concat(a[#a],"]");b=apply(v->c[v],eval(fold((x,y)->concat(x,y),a)))
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