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Scilab help >> Elementary Functions > logm

logm

square matrix logarithm

Calling Sequence

y=logm(x)

Arguments

x

square matrix

Description

logm(x) is the matrix logarithm of x. The result is complex if x is not positive or definite positive. If x is a symmetric matrix, then calculation is made by schur form. Otherwise, x is assumed diagonalizable. One has expm(logm(x))=x.

Examples

A=[1,2;3,4];
logm(A)
expm(logm(A))

A1=A*A';
logm(A1)
expm(logm(A1))

A1(1,1)=%i;
expm(logm(A1))

See Also

  • expm — square matrix exponential
  • log — natural logarithm
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with contributors 		Last updated:
Thu May 12 11:44:14 CEST 2011