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how to plot tripulse in between two impulses (how to stem and plot) the tripulse not discrete it is continous but the two impulses are discrete matlap

HOW I CAN GENERATE the follwing in matlab.. snd me its complete code.
1.x[n]={2 0 1 2}
2.x[n]-x[n-2]-1/2x[n+4]
3.x[n]-3/4x[n-1]2x[n+2]
4.x1[n]u[n]
5.x1[n]u[n-2]

i was asked to do correlation and coherence of signals. it is basically comparing 4 signals over different sessions.How can this be computed using matlab.Will appreciate your response

I've created a virtual phantom with dim 64*64. As well I have a 1GB file of numbers with lenght 6357087. I want matlab to take some of these values and multiply them by an algorithm and then increment certains numbers and take other values over {let's say 32 times}. The values should be put on some pixel of the virtual phantom. My code is this:
for p1 = 1:31 %initializing the number of rows in the phantom
for h1 = 1:64 %initializing the number of rows
N1 = 380 %number of first group of numbers in the text file that will be used
for ph1 = 1:N1
M(:,ph1) = A*M(:,ph1-1)+B;
gradPE1 = Gyro_ratio(B0+PE_val1(ph1)*dT/Tpe*Ry1);
M(p1,h1) = zrot(gradPE1)*M(:,ph1);
So I need to increment another 380 values before using other group of 380 numbers from my text file. I need to repeat this process at least 32 times. Please help me with this.

i m doing project on image stegonogrphy...m doing in wavelet...first cover image divided 2 level DWT once..then secret image divided 2lveel twise..secret image is double the size of cover..then secret is encrypted ..then they are fused...n then retwirval..all m getiing..but m nt ghetting my cover and stego imge as same...so wat to.doo..plzzzzzzzzzz