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BUILT-IN MATHEMATICA SYMBOL
DiskMatrix
DiskMatrix[r]
gives a matrix whose elements are 
in a disk-shaped region of radius r, and are otherwise 
.
DiskMatrix[r, w]
gives a w×w matrix containing a disk of 
s with radius r.
DiskMatrix[{r1, r2, ...}, ...]
yields an array whose elements are 
in an ellipsoidal region with semiaxis 
in the i
index direction.
Details and Options
- The disk of
s is always at the center of the region. - In DiskMatrix[r] or DiskMatrix[{r1, ...}] the matrix or array is sized so as to just include all nonzero elements.
- The disk-like region is taken to be the best discrete approximation to a circular disk possible given the size of the matrix.
- DiskMatrix[All, w] gives a w×w matrix containing a disk that is as large as possible.
- DiskMatrix[..., {w1, w2, ...}] gives a
array. - DiskMatrix[{r1, ..., rn}, w] gives a
array. - DiskMatrix[All, {w1, ..., wn}] gives a
array containing an ellipsoid that is as large as possible. - The radius r need not be an integer; in general elements are
if their distance from the center is not more than 
. - For integer r, DiskMatrix[r] yields a
×
matrix.
Examplesopen all
Basic Examples (1)
This computes and plots a square disk-shaped matrix of radius 7:
| In[1]:= |
| Out[1]= |  |
New in 7
