How to format numbers in exponential notation with base 1e3

Hi,

I want to format numbers to a exponential notation with the base 1e3.

For example I have a vector a:

a = [25.12; 67.29; 120.00; 256.65; 501.58; 1366.26];

All numbers should have the same 5 digits with a precision of 4 in exponential notation with the base 1e3. So the output should be:

b = 1e3 * [0.0251 0.0673 0.1200 0.2567 0.5016 1.3663];

Does anybody know how to do this?

Thanks!

Answer 1

[Star Strider]

This will correctly calculate tha mantissas:

rfxm = @(x,xpnt) [sign(x).*10.^(log10(abs(x))-xpnt)];                   % Anonymous Function Creating Reformatted Number

so:

a = [25.12; 67.29; 120.00; 256.65; 501.58; 1366.26];
xpnt = +3; 
Out = rfxm(a,xpnt)

produces:

Out =
    0.0251
    0.0673
    0.1200
    0.2567
    0.5016
    1.3663

This is as close as I can get to your desired output:

    Out = [sprintf('1e%d * [',xpnt) sprintf('%.4f\t',  rfxm(a.',xpnt)) ']']

.