Exponential of very large number

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.

[Matt J]

It wouldn't make sense to take exp() to any greater precision unless you are going to take the log of it later.

Answer 1

[Chunru]

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(:) 

xstr = 2×1 string array
    "0.47516 x 10 ^ -1023"
    "0.1038 x 10 ^ 127565"

[Teshome Kumsa]

I edited my question, because I forgot to devide my vector by 10.^5. Still the answer is similar.

let me do as you did and see.

Thanks

[Chunru]

The code uses your edited numbers now.

[Steven Lord]

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?