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

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Ruby 2014-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/116259-how-can-i-find-the-mean-and-standard-deviation-of-a-plot

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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Image Analyst 2014-2-15

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

http://www.mathworks.com/matlabcentral/answers/728-how-do-i-write-a-good-question-for-matlab-answers

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

Ruby 2014-2-16

thank you sir....

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Answer 1

dpb 2014-2-15

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https://ww2.mathworks.cn/matlabcentral/answers/116259-how-can-i-find-the-mean-and-standard-deviation-of-a-plot#answer_124513

在 MATLAB Online 中打开

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????