File: tanm.sci

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scilab 2.4-1
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function x=tanm(a)
//Matrix wise Tangent

// Copyright INRIA
if a==[] then x=[],return,end
[m,n]=size(a)
if m<>n then error(20),end
//diagonalization
[x,t,bs]=bdiag(a+0*%i*ones(a),1/%eps)
if find(bs>1)<>[] then error('Matrix is not diagonalisable'),end
x=t*diag(tan(diag(x)))/t
if and(imag(a)==0) then x=real(x),end