How to use "hold on" for multiple datasets on the same graph?

Question

Mohsen 2014-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/126495-how-to-use-hold-on-for-multiple-datasets-on-the-same-graph

回答： Mohsen 2014-4-22

Hi,

I am trying to plot 5 different datasets for 3 patients (15 lines in total) on the same graph. The Y value for each line is between 0 and 100 but the X axis is different for each line.

The problem is that the "hold on" function is not working. I think the reason is that I am using different x axis values for each data set.

The output of my code is just the graph of the 5 rois for the last patient (patient_Plan3).

Any ideas how to fix this?

Here is my code:

Note: DVHxAccum and DVHyAccum are 5x1 cells each containing the data that I want to plot.

    patient_Plan1='path1';
    patient_Plan2='path2';
    patient_Plan3='path3';
    patient_PlanNames={patient_Plan1, patient_Plan2, patient_Plan3};
    totPatient_PlanNum=length(patient_PlanNames);
    figure;
    hold on;
    roiName = { 'Contralateral_Lung', 'rPTV', 'nonGTVLUNG', 'CTV', 'Ipsilateral_Lung'};
    axis([0 7500 0 110]);
    markers = {'-','.','--'};
    Color={'c','m','b','r','g', 'k'};
    for j=totPatient_PlanNum
        planDir = strcat('O:\WorkstationDB\',patient_PlanNames{j});
        [DVHxAccum DVHyAccum] = getDVHAccum(planDir, roiName);
        for i = 1:length(roiName)
            plot(DVHxAccum{i}, DVHyAccum{i}, [markers{j} Color{i}],'LineWidth',1);     
        end
    end

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Answer 1

Mohsen 2014-4-22

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I found it:

for j=totPatient_PlanNum

should be changed to

for j=1:totPatient_PlanNum

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Answer 2

Image Analyst 2014-4-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126495-how-to-use-hold-on-for-multiple-datasets-on-the-same-graph#answer_134017

在 MATLAB Online 中打开

The "hold" applies to a specific axes control, and you don't have one yet. You're calling hold on before there's even any axes to hold. Try calling it after you call plot for the first time.