finding the power of a number

hello, actually what i wanted to know is: if i have a number like 0.6543e+013. Now i just need 0.6543.so i need to divide by 10^the power.but i cant understand how to find this value of power.Is there any function available in matlab that can give me my value...?

Thank you, Ekta

Answer 1

[Azzi Abdelmalek]

a=0.6543e+013 
power=ceil(log10(a)-1)
b=10^(log10(a)-power)

% the result b is always between 1 and 10, if you want the result to be between 0 and 1 add

power=power+1
b=b/10

[Ekta Shah]

Thanks a lot.My problem is sorted.

Answer 2

[Andrei Bobrov]

x = 0.6543e+013

x*10^-ceil(log10(x))

Answer 3

[Jan]

What is the wanted result for:

123.456
0.0000000000123