I am trying to eliminate the negative Y-axis (-0.2 portion in the image below). So that the Y-axis of the graph starts from zero. I have attached the .mat file. Please help me out. Here is my code:

Question

Biswarup Dutta 2017-3-14

关闭： MATLAB Answer Bot 2021-8-20

clc
a=importdata('robin roy.mat');
b=a.data;
x=b(22000:25830,1);
plot(x);
x(x<0)=[];
findpeaks(x);
findpeaks(x,'MinPeakHeight',1.15);

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Answer 1

Geoff Hayes 2017-3-14

Biswarup - try setting the y-axis limits using ylim as

ylim([0 1.4]);

Biswarup Dutta 2017-3-14

Hi Geoff, I have tried that but it does not work. Here is my updated code:

clc
a=importdata('robin roy.mat');
b=a.data;
x=b(22000:25830,1);
plot(x);
ylim([0 1.4]);
x(x<0)=[];
findpeaks(x);
findpeaks(x,'MinPeakHeight',1.15);

Correct me if I have done anything wrong.

Geoff Hayes 2017-3-14

Hmmm...it works fine when I do something like

 x = -2*pi:0.01:2*pi;
 y = sin(x);
 plot(y);
 ylim([0 2])

What happens when you try the above example code?