Matlab Arithmetic Operations

Arithmetic Operations

This note focuses on the basic arithmetic functions; for the basic operations exposed via operators, see Matlab Matrix Operations and Matlab Array Operations.

Modulo Division

• mod: remainder
  • mod(a,m) returns the remainder after division of a by m
  • = a - m.*floor(a./m)
  • mod(a,0) returns a
• rem: remainder
  • rem(a,m) returns the remainder after division of a by m
  • = a - m.*fix(a./m)
  • rem(a,0) returns NaN
• idivide: integer division
  • idivide(a,b,<opt>) returns a/b rounded according to opt
  • opt defaults to 'fix'; allowed values are 'fix', 'floor', 'ceil', 'round'

Rounding

• round rounds half up away from 0
• fix rounds towards 0
• floor rounds towards negative infinity
• ceil rounds towards positive infinity