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How to Round toward negative infinity in MATLAB

  • Last Updated : 06 Jul, 2021

Rounding a number towards infinity means rounding the number X to the nearest integer less than or equal to X. In this article, we will discuss how to round toward negative infinity in MATLAB.

Example:

Suppose X = 3.5, then result is 3
And if X = -3.5, then result is -4 

The floor() function in MATLAB can be leveraged to round the number towards negative infinity. Different syntaxes of floor() function in Matlab are

  • Y = floor(val)
  • Y = floor(X)
  • Y = floor(t)
  • Y = floor(t,unit)

Now we will discuss the syntaxes of the above function:

Y = floor(val):

  • Rounds the element val to the nearest integer less than or equal to val.

Matlab






% Input vector
% Input vector
val = -3.1;
 
% Rounding the elements in vector
Y = floor(val);
 
% Printing the rounded vector
disp(Y)

 
 Output :

-4

Y = floor(X):

  • The function takes input as a vector of elements X.
  • Returns the vector by rounding each element in X toward negative infinity.
     

Matlab




% Input vector
% Input vector
X = [-1.2  -0.2  -4.4  7.6  -12.0];
 
% Rounding the elements in vector
Y = floor(X)
 
% Printing the rounded vector
disp(Y)

 
 Output :

-2    -1    -5     7   -12

Y = floor(t):

  • Here t is an array of duration in “hh:mm:ss:SS”
    • hh: Hours
    • mm: Minutes
    • ss: Seconds
    • SS: Milliseconds
  • Rounds every element of array t to its nearest number of seconds less than or equal to the element.
     

Matlab




% Array of duration
t = hours(5) + minutes(2:4) + seconds(1.78);
 
%  Format the array into time format
t.Format = 'hh:mm:ss.SS';
 
% Display initial duration array
disp("duration :")
disp(t);
 
% Rounding the duration array
Y1 = floor(t);
disp("Rounded duration :");
disp(Y1);

 
 Output :

duration :
   05:02:01.78   05:03:01.78   05:04:01.78

Rounded duration :
   05:02:01.00   05:03:01.00   05:04:01.00

Y = floor(t,unit):

  • Here t is the duration array where every element in the format of “hh:mm:ss:SS”
  • Rounds each element of t to the nearest number of the specified unit of time less than or equal to that element.
  • Unit of time can be ‘seconds’, ‘minutes’, ‘hours’, ‘days’, or ‘years’.
  • The default value of unit is ‘seconds’.
     

Matlab




% Array of duration
t = hours(5) + minutes(2:4) + seconds(1.78);
 
%  Format the array into time format
t.Format = 'hh:mm:ss.SS';
 
% Display initial duration array
disp("duration :")
disp(t);
 
% Rounding the duration array to the nearest minutes
% less than or equal to element
Y1 = floor(t,'minutes');
disp("Rounded duration :");
disp(Y1);

 
 Output :

duration :
   05:02:01.78   05:03:01.78   05:04:01.78

Rounded duration :
   05:02:00.00   05:03:00.00   05:04:00.00



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