How to plot the error between two signals?

2017 9 25
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更新时间：2017 9 27
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I did the filtering of an EEG signal using fir filter then i implement this fiter in c langage. Now i need to plot the error between the to filter but i don't know how to do that. Can anyone help me please.

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Chad Greene
Chad Greene 2017-9-25
It's not clear whether your question is about plotting commands or signal processing techniques. Please clarify.
afef
afef 2017-9-25
I have 2 signals and i want to plot the error between the 2
Walter Roberson
Walter Roberson 2017-9-25
... and the error has to be plotted in C language ?
How do you define "error" for your purposes ?
afef
afef 2017-9-25
编辑：Walter Roberson 2017-9-25
NO i want to plot this with Matlab . i tried this :
load('C:\Users\del.dell-PC\pfe\base de donnée\patient sans crise\chb23_16_edfm.mat')
deriv1=(val(1,:)-0)/2.559375;
Fs=256;
t1=(0:length(deriv1)-1)/Fs; %valeur du temps de tout échantillon%
d1=designfilt('lowpassfir','PassbandFrequency',0.45,'StopbandFrequency',0.5,'PassbandRipple',3,'StopbandAttenuation',60,'DesignMethod','equiripple');
a = filtfilt(d1,deriv1);
x=[-41.023197 -29.971899 -6.535204 6.053481 .... ];
figure(1),hold on;
plot(deriv1);
plot(a,'LineWidth',1);
hold off;
figure(2),hold on;
plot(deriv1);
plot(x,'LineWidth',1);
hold off;
figure(3),hold on;
plot(a);
plot(x,'LineWidth',1);
hold off;
X are the values of filtered signal with my c code and a the result of filter with Matlab
And i want to know is there a way to plot the error i mean by that the differnce between the two signals.

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KSSV
KSSV 2017-9-26

0 个投票

x = 1:10;
y1 = 2*x;
y2 = 3.5*x;
% error
dy = y2-y1 ;
% Multiple plot commands, with "hold" on
figure
hold on
plot(x,y1,'r');
plot(x,y2,'b');
plot(x,dy,'g');
%
legend('Signal1','Signal2','error')

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afef
afef 2017-9-26
I don't understand this part .Can you explain this to me please?
x = 1:10;
y1 = 2*x;
y2 = 3.5*x;
Walter Roberson
Walter Roberson 2017-9-26
编辑：Walter Roberson 2017-9-26
KSSV needed some data for illustration purposes, so he created a range of x from 1 to 10, and created one line as 2*x and a second line as 3.5 * x. In your actual code you would replaces those three lines with your own data.
afef
afef 2017-9-27
Ok i understand now.thanks

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