How to round up all components of a matrix to nearest 'k' decimal

Hi,

Does anyone know how I can change this:

d =

     0.017869069824194415755502531669223
   -0.0050797537564829351997036551331211
   -0.0077677772808408665487476505869037

to this:

d =

     0.018
   -0.005
   -0.008

Actually I want to round it up in the 3rd decimal. Thanks.

Answer 1

[Walter Roberson]

vpa(d,3)

We can tell from the number of decimal places that you show that you must be using symbolic numbers, so you can use vpa() to evaluate to a specific number of decimal places.

There is no way to round double precision numbers to a particular number of decimal places, because 0.1 is not exactly representable as a finite binary floating point number, for the same reasons that 1/7 is not exactly representable as a finite decimal number.