I am reading the book " MATLAB: A practical introductoin programming and problem solving", written by Stormy Attaway and getting curious with the function "num2str".
On page 256, the author used the following steps to convert a number into a string
str2 = num2str(3.456789)
str2=
3.4568
Why are the digits 7 and 9 obmitted? In general, how can we know what the obmitted digits are?
Thank you for your help.