matlab basic functions inf, isempty, round

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inf

• in matlab inf infinity '+ ∞, -inf is infinitesimal quantity -∞, when Matlab program execution, even in the face of a zero-divisor operation, it will not terminate the program running, but only to give a "divide by zero" Warning and assigns the result to inf, to continue

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isempty

• Decide whether an array is empty

  description

• If A is an empty array, then return isEmpty TF = (A) a logical 1 (true), otherwise a logical 0 (false). Empty array has a size of at least zero dimensions.

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round

• Rounded to the nearest decimal point or integer

  description

• Y = round (X) of each element X, rounded to the nearest integer
• Y = round(X,N)
  • Y = Integer (X, N) rounded to N bits:
  • N> 0: N rounded to the right of the decimal place.
  • N = 0: rounding to the nearest integer.
  • N <0: N bits to the left of the decimal point are rounded.
• Y = round (X, N, type) specifies the type of rounding. Specify "significant" rounding to N bits of significant digits (counting from the left-most digit). In this case, N must be a positive integer.
• Y = round (t) the duration of each element of the array t is rounded to the nearest second.

• Y = round (t, unit) t of each element of rounded to the nearest specified number of time units.

  Examples

X = [2.11 3.5; -3.5 0.78];
Y = round(X)
Y =

     2     4
    -4     1
% 四舍五入到指定的小数位数
Y = round(pi,3)
Y =

    3.1420
% 四舍五入到最接近100的倍数
round(863178137,-2)
ans =

   863178100

The elements rounded to the specified number of significant digits

The elements of the vector rounded to two significant digits reserved

x = [1253 1.345 120.44]
y = round(x,2,'significant')
x =

         1253        1.345       120.44


y =

         1300          1.3          120

Rounded to time

The duration of each value in the array are rounded to the nearest second

t = hours(8) + minutes(29:31) + seconds(1.3:0.5:2.3);
t.Format = 'hh:mm:ss.SS'
t =

   08:29:01.30   08:30:01.80   08:31:02.30

Y1 = round(t)
Y1 =

   08:29:01.00   08:30:02.00   08:31:02.00

Round each value in t to the nearest number of hours.

Y2 = round(t,'hours')
Y2 =

   08:00:00.00   09:00:00.00   09:00:00.00

Input parameters