How Functions Use fimath

Functions that use then discard attached fimath

Functions	Note
conv, filter	Error if attached fimaths differ.
mean, median	—

Functions that ignore and discard attached fimath

Functions	Note
accumneg, accumpos	By default, use Floor rounding method and Wrap overflow
add, sub, mpy	Override and discard any fimath objects attached to the input fi objects Uses the fimath from input, F, as in add(F, a, b)
CORDIC functions (see Fixed-Point Math Operations in MATLAB and Simulink)	CORDIC functions use their own internal fimath: Rounding Mode – Floor Overflow Action – Wrap
mod	—
qr	—
quantize	Uses the math settings on the quantizer object, ignores and discards any fimath settings on the input
Trigonometric functions — atan2, cos, sin	—

Functions that do not perform math

Functions	Note
Built-in Types—int32, int64, int8, uint16, uint32, uint64, uint8	Ignore any fimath settings on the input. Always use the rounding method Round when casting to the new data type. The output is not a fi object so it has no attached fimath.
bitsll, bitsra, bitsrl	OverflowAction and RoundingMethod are ignored — bits drop off the end.
bitshift	RoundingMethod is ignored, but OverflowAction property is obeyed.