[Scilab-users] Question about expm function

[Stéphane Mottelet]

Hello,

The matrix exponential is defined as

expm(A)=I+A+1/2*A^2+...+1/k!*A^k+...

where the "*" denotes the matrix product.

You can obtain what you wanted with

exp(A)

i.e. element-wise exponential of A

S.

Le 02/02/2017 à 09:49, Jean Rubagenga a écrit :
> Hi,
>
> I am trying to use expm() and do not get what I am expecting.
>
> I enter A = [1,0.5,0.7;0.3,0.7,1;1,0,1]
> and B = expm(A)
> and get as result
>
> B =
>
>     4.1672519 1.3854159    2.8881517
>
>     2.1672628 2.4007931    3.0513947
>
> 3.17163590.66800663.96685.
>
> I expected the matrix B elements to be exponents of corresponding 
> elements of matrix A. For example
> B(1,1) = B(2,3) = B(3,1) = B(3,3) = 2.7182818
>
> Could you please explain to me what is going on?
>
> Thanks
>
> Jean
>
>
>
>
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