Question: how do i write following code in maple ?

Hi

i have vector like

Lambda := Vector[row](4, {(1) = *x[1]+.987329667009504589705605634543*x[2]-.436101517853804204529756811668*x[3]+.129526898189138290691985450717*x[4]-u[1], (2) = -1.90060788691970327587464611304*x[1]+.73919873843577037910167897814*x[2]+.20740624192749301981208286864*x[3]-0.45997093443560123039115733769e-1*x[4]-u[2], (3) = -.90583425825293904132909638808*x[1]-.63522563126813377056284195404*x[2]+.28771415757341360851847098373*x[3]+.25334573194765920337346735830*x[4]-u[3], (4) = -1.09745135827817665891430946698*x[1]+.3569463183370574834390092104*x[2]-1.0463476282509211343139483201*x[3]+.78685266819204030978924857651*x[4]-u[4]})

i want to set 2 column till 4 equal zero, i mean

-1.90060788691970327587464611304*x[1]+.73919873843577037910167897814*x[2]+.20740624192749301981208286864*x[3]-0.45997093443560123039115733769e-1*x[4]-u[2]=0

-.90583425825293904132909638808*x[1]-.63522563126813377056284195404*x[2]+.28771415757341360851847098373*x[3]+.25334573194765920337346735830*x[4]-u[3]=0...

how can i do it

thanks