How to calculate mantissa of 0.5

Is there any function to calculate the mantissa of 0.8 by matlab?

Answer 1

[Star Strider]

I created a little utility function to calculate the mantissa and exponent of a floating-point number a while ago, for my own use.

Trying it here —

expstr = @(x) [x(:).*10.^ceil(-log10(abs(x(:)+(x==0)))) floor(log10(abs(x(:)+(x==0))))];
expstr([0.5; 0.8])

ans = 2×2

5 -1 8 -1

The mantissa is the first element and the exponent is the second element in each row.

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[Osamah Alayafi]

Thanks alot. If I understand you correctly, the mantissa of 0.5 is 5?

[Star Strider]

My pleasure!

Yes.

The exponent (in this instance) is -1.

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