eq

Determine whether real-world values of two fi objects are equal

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Syntax

c = eq(a,b)
a == b

Description

c = eq(a,b) is called for the syntax a == b when a or b is a fi object. a and b must have the same dimensions unless one is a scalar. A scalar can be compared with another object of any size.

a == b does an element-by-element comparison between a and b and returns a matrix of the same size with elements set to 1 where the relation is true, and 0 where the relation is false.

In relational operations comparing a floating-point value to a fixed-point value, the floating-point value is cast to the same word length and signedness as the fi object, with best-precision scaling.

Examples

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Open Live Script

Use the isequal function to determine if two fi objects have the same real-world value. 

a = fi(pi);
b = fi(pi, 1, 32);
a == b
ans = logical
   0

Input a has a 16-bit word length, while input b has a 32-bit word length. The eq function returns 0 because the two fi objects do not have the same real-world value.

Open Live Script

When comparing a double to a fi object, the double is cast to the same word length and signedness of the fi object. 

a = fi(pi);
b = pi;
a == b
ans = logical
   1

The eq function casts b to the same word length as a, and returns 1. This behavior allows relational operations to work between fi objects and floating-point constants without introducing floating-point values in generated code.

Extended Capabilities

HDL Code Generation
Generate Verilog and VHDL code for FPGA and ASIC designs using HDL Coder™.

See Also

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Introduced before R2006a

Fixed-Point Designer Documentation

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