how to plot values that only fall within a range?
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have an excel file where i am plotting the values that are around 113 KPH. there are thousands of rows for that specifc column and i just wanna plot the Y values that fall between 111KPH and 114 KPH. I also am trying to add the average of those data points but that doesnt seem to work as well. I attached the plot which is incorrect and for some reason is between 0 and 1.
code is:
%%% 70 MPH KPH vs Time
filename = 'TeslaData_Coastdown Analysis_7_26_2019.xlsx';
figure(1)
X = xlsread(filename,'70 MPH','A9:A2000');%adjust according to column length
Y = xlsread(filename,'70 MPH','B9:B2000');%adjust according to column length
FVY = (Y >= 111 & Y <= 114)
KPH_70 = mean(FVY);
yyaxis left
plot(X,FVY);
yyaxis right
plot(X,KPH_70);
采纳的回答
KPH_70 = mean(Y(FVY));
yyaxis left
plot(X(FVY),Y(FVY));
yyaxis right
plot(X(FVY),KPH_70*ones(size(FVY)));
17 个评论
isamh
2020-1-15
isamh
2020-1-15
Matt J
2020-1-15
only issue is the average curve.
What is the issue?
isamh
2020-1-15
You mean so that the two y-axes span the same range? Here's one way,
KPH_70 = mean(Y(FVY));
yyaxis left
plot(X(FVY),Y(FVY));
yl=ylim;
yyaxis right
plot(X(FVY),KPH_70*ones(1,nnz(FVY)),'-' )
ylim(yl);
isamh
2020-1-15
Matt J
2020-1-15
I think I fixed it. However, I don't really understand why you have two y-axes as opposed to putting multiple plot lines on a single y-axis.
isamh
2020-1-15
Matt J
2020-1-15
Just by doing
plot(X(FVY),Y(FVY), X(FVY),KPH_70*ones(size(FVY)) );
also, what does *ones(size(FVY)) mean?
It creates a vector of ones the same size as FVY, e.g.,
>> FVY=rand(1,5)
FVY =
0.8184 0.3599 0.3480 0.2924 0.0110
>> ones(size(FVY))
ans =
1 1 1 1 1
i tried this earlier but only one curve shows.
Seems doubtful that you tried exactly what I've shown. If you didn't know what ones(size(FVY)) even means, how would it have occurred to you to try it?
Sorry, it should be
plot(X(FVY),Y(FVY),'x--', X(FVY),KPH_70*ones(1,nnz(FVY)),'-' )
Matt J
2020-1-15
Here is an example,
X=1:10;
Y=rand(size(X));
FVY=X>3;
KPH_70=mean(Y(FVY));
plot(X(FVY),Y(FVY),'x--', X(FVY),KPH_70*ones(1,nnz(FVY)),'-' )
isamh
2020-1-15
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