Matlab: Unit Impulse δ[n] 單位脈衝函數

The unit impulse, or the Dirac delta function, has zero values for all input values except a value of one at zero.

To plot the unit impulse function δ[n], type the Matlab code below:

>> t = -10:10;
>> s = (t==0); %s is one only when t equals 0
>> stem(t,s)

Result:

For δ[n-2], the Matlab code is

>> t = -10:10;
>> s2 = (t==2); %s is one when t equals 2
>> stem(t,s2)

Result:

Reference:

DSP terms 數位訊號處理基本名詞 (StudyEECC)

Dirac Delta Function (Wikipedia)

Matlab: Plot discrete sequence data with STEM() 繪製離散序列資料 (StudyEECC)