how can i find the mean and standard deviation of a plot????

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Ruby
Ruby 2014-2-15
评论： Ruby 2014-2-16
sir.... with this code i find out the notch and low pass response of a given data.... how can i find the standard deviation and mean of the plot????
fid = fopen('filename.txt'); datacell= textscan(fid,'%f%f%f%*[^\n]',... 'delimiter','\t'); fclose(fid); A = datacell{2}; B=datacell{3}; C=A-B; A1= squeeze( sum( reshape(A, 40, [], 1) ) ); B1=squeeze( sum( reshape(B, 40, [], 1) ) ); C1=A1-B1; subplot(3,1,1); stem(C1); b=[0.69977431651797461 -0.1814575955924495 1.4113120181091672 -0.18145759559244945 0.69977431651797473]; a=[1 -0.21440197757618362 1.3190484139225416 -0.148513213608716 0.491812237222576]; y =filter(b,a,C1); subplot(3,1,2); stem(y); d=[0.0000089848614639706426 0.0000035939445855882617 0.0000053909168783823964 0.0000035939445855882685 0.00000089848614639706807] e=[1 -3.8358255406473472 5.5208191366222277 -3.5335352194630145 0.8485559996647685] z=filter(d,e,C1); subplot(3,1,3); stem(z);

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dpb
dpb 2014-2-15
It would be much simpler if you followed the suggestions IA has given, but since each subplot seems to be a stem of some variable, the answer would seem to be that you would consult
doc mean
doc std
and apply them to the various variables which you in turn plotted. That seems so patently obvious however that surely there's more to the question than that????

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