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DiscreteDelta

Usage

• DiscreteDelta[ , , ... ] 给出离散delta函数 ,如果所有 都等于0,则它等于1，否则它等于0.


Notes

• DiscreteDelta[0] 等于1；而对其它数字 n ，DiscreteDelta[n]等于0.
•DiscreteDelta具有Orderless属性.
• 参见Mathematica全书: 3.5.12节.
• 同时参见: IdentityMatrix, UnitStep, If, Signature, DiracDelta.
Further Examples

This picks an element out of a double sum.

In[1]:=  

Out[1]=



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