MATLAB Function Reference |

Determine frequency spacing for frequency response

**Syntax**

[f1,f2] = freqspace(n) [f1,f2] = freqspace([m n]) [x1,y1] = freqspace(...,'meshgrid') f = freqspace(N) f = freqspace(N,'whole')

**Description**

returns the implied frequency range for equally spaced frequency responses. `freqspace`

`freqspace`

is useful when creating desired frequency responses for various one- and two-dimensional applications.

returns the two-dimensional frequency vectors `[f1,f2] = freqspace(n)`

`f1`

and `f2`

for an `n`

-by-`n`

matrix.

For `n`

odd, both `f1`

and `f2`

are `[-n+1:2:n-1]/n`

.

For `n`

even, both `f1`

and `f2`

are `[-n:2:n-2]/n`

.

returns the two-dimensional frequency vectors `[f1,f2] = freqspace([m n])`

`f1`

and `f2`

for an `m`

-by-`n`

matrix.

`[x1,y1] = freqspace(...,'meshgrid')`

is equivalent to

returns the one-dimensional frequency vector `f = freqspace(N)`

`f`

assuming `N`

evenly spaced points around the unit circle. For `N`

even or odd, `f`

is `(0:2/N:1)`

. For `N`

even, `freqspace`

therefore returns `(N+2)/2`

points. For `N`

odd, it returns `(N+1)/2`

points.

returns ```
f = freqspace(N,'whole')
```

`N`

evenly spaced points around the whole unit circle. In this case, `f`

is `0:2/N:2*(N-1)/N`

.

**See Also**

fread | frewind |

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