Exponential of very large number
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Hello all! I was trying to calculate exponental of some vectors. Actually my vector has very big entries(each entries are Stresses accumulated during earquakes. That is why they are very big).
For example
exp([-235628865.417257 29372700213.5032]/10.^5)
It returns ans=
0 Inf
I need a comment on it.
1 comentario
Matt J
el 28 de Ag. de 2021
It wouldn't make sense to take exp() to any greater precision unless you are going to take the log of it later.
Respuestas (1)
Chunru
el 28 de Ag. de 2021
Editada: Chunru
el 28 de Ag. de 2021
Those number are beyond the scope of double numbers. You can try vpa. Alternatively, keep track of the mantisa and exponent yourself as follows:
a=log10(exp(1))*([-235628865.417257 29372700213.5032]/10.^5);
aint = ceil(a);
afrac = a -aint;
xm = 10.^afrac;
xe = aint;
xstr = xm(:)+" x 10 ^ "+xe(:)
3 comentarios
Steven Lord
el 28 de Ag. de 2021
What are you hoping to do with those answers? Are you planning on dividing them by exp(x) for some other value of large magnitude?
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