i have a problem rounding a loop

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Raul Castillo 2019-11-6

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评论： Steven Lord 2019-11-7

so if i write a loop that and it gives me a answer of .0215243225 you know just a huge number but i wanted to round it to the .0001, .001, .01. how would i do that i m using a for statment for a loop

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Shubham Gupta 2019-11-7

编辑：Shubham Gupta 2019-11-7

在 MATLAB Online 中打开

Do you want to round the value to significant digits, which will change in a loop? For e.g.

a_answer= .0215243225;
for i = 2:5
    output = round(a_answer,i)
end
% You will get output
output =
         0.02
output =
        0.022
output =
       0.0215
output =
      0.02152

It's basically the same method as mentioned by John, only instead of looping on values I looped it for significant digits.

Steven Lord 2019-11-7

在 MATLAB Online 中打开

Shubham Gupta,

You can do that without manually adjusting the number of digits by specifying the 'significant' option in your call to round.

>> a_answer= .0215243225;
>> round(a_answer, 3, 'significant')
ans =
                    0.0215
                    
>> b = pi/1000;
>> round(b, 3, 'significant')
ans =
                   0.00314
>> round(b, 5)
ans =
                   0.00314