matlab - rounding to n significant digits -

i'm trying write code in matlab round number (as ask) important digits.

i'm not sure how it. suggestions?

to round d significant digits:

>> d = 3; %// number of digits >> x = 5.237234; %//  illustration number  >> d = 10^(d-ceil(log10(x))); >> y = round(x*d)/d y =     5.2400

to round d decimal digits:

>> d = 3; %// number of digits >> x = 5.237234; %//  illustration number  >> d = 10^d; >> y = round(x*d)/d y =     5.2370

matlab floating-point digits significant-digits

Jaimee