Multiple plots in the same figure

Question

Carlos Correia 2020-3-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513168-multiple-plots-in-the-same-figure

评论： Carlos Correia 2020-3-26

I have a complex function:

function [FinalResults,Plotting]=Dicom_Reading(Variables)
 Plotting=gobjects(5,1);% declare the graphics object
figure 
hold on
.
.
.
% other commands
.
.
.
for n=1:5
    % other commands
    Plotting(n)=plot(x,y,chosencolor,'DisplayName',material)
    legend(Plotting(1))% I do this get only 1 legend as they are all the same
end

x and y are different each time.

chosencolor is a string choosing the color.

material is a string with what I would like to have in the legend.

I believe the function is set up correctly as I do indeed get a figure with only 1 legend and 5 curves all of the same color.

I would like to run the function 3 different times for different variables and afterwards combine all the plots in the same graph so that I can compare them.

I expected that

[FinalResults1,Plotting1]=Dicom_Reading(Variables1)
[FinalResults2,Plotting2]=Dicom_Reading(Variables2)
[FinalResults3,Plotting3]=Dicom_Reading(Variables3)
hold on
Plotting1;
Plotting2;
Plotting3;

would work but it is not doing anything, I still get 3 different figures.

Maybe it has something to do with the fact that Plotting1, Plotting2 and Plotting 3 return as 5x1 Line arrays instead of plots?

I also tried changing the code in the function itself by switching the place of the hold command to

for n=1:5
    % other commands
    hold on
    Plotting(n)=plot(x,y,chosencolor,'DisplayName',material)
    legend(Plotting(1))% I do this get only 1 legend as they are all the same
end

This does in fact allow me to get all the 15 plots in the same graph but now I only get the legend for the 3rd plot.

I would like to know if there is a solution to this, either combining the 3 plots in the first case or getting all 3 legends in the second case.

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Answer 1

Cris LaPierre 2020-3-26

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/513168-multiple-plots-in-the-same-figure#answer_422164

在 MATLAB Online 中打开

You have a figure command in your Dicom_Reading function. This will create a new figure window. This is why, when you run the function 3 times, you get 3 separate figures.

Best practide is to always have a hold off command to balance out a hold on. You could put one at the bottom of your function.

function [FinalResults,Plotting]=Dicom_Reading(Variables)
.
.
.
% other commands
.
.
.
Plotting=gobjects(5,1);% declare the graphics object
hold on
for n=1:5
    % other commands
    Plotting(n)=plot(x,y,chosencolor,'DisplayName',material)
    legend(Plotting(1))% I do this get only 1 legend as they are all the same
end
hold off