Round value ???
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Dear all,
I have to round a number to a specified number of decimal points.Anybody can help me??
Thank you
0 Kommentare
Akzeptierte Antwort
Daniel Shub
am 18 Okt. 2011
There are a number of submissions on the FEX:
Two that look promising are:
and
0 Kommentare
Weitere Antworten (2)
Walter Roberson
am 18 Okt. 2011
That cannot be done exactly in binary floating point arithmetic. Just the same way that you cannot exactly represent 1/3 in a fixed number of decimal digits, 1/100 cannot be exactly represented in binary digits.
It is possible to display something with two decimal places, such as by using
disp(sprintf('%.2f', 343.945584))
but you cannot store 343.95 exactly in a floating point number: try
sprintf('%.99f\n', 343.95)
and notice that it is not exactly 343.95 that is stored.
If you do not mind that you can only numerically get a close approximation, then use:
round(N*100)/100
1 Kommentar
Image Analyst
am 18 Okt. 2011
Walter, as you know this is a frequently asked question, since you've repeated it bazillions of times. Yet it's not in the FAQ (that I could find anyway). I'm thinking it should be added to section 6 on Math/Algorithms. What do you think? You can add it, or I could if you want.
Pritesh Shah
am 18 Okt. 2011
Also, Please see Cell, fix and round function for the same. If you want decimal point fix,
Also, You can you format function.
Thank you
1 Kommentar
Walter Roberson
am 18 Okt. 2011
I think you mean ceil rather than cell.
The "format" function cannot be used to get a precise number of decimal places, except for "format bank"
Siehe auch
Kategorien
Mehr zu Logical finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!