Legend when plotting with while

Question

Viktor G. 2020-2-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508193-legend-when-plotting-with-while

评论： Cameron B 2020-2-29

Hey guys,

so i am trying to plot multiple variables from an excel file and I can't get around with it. What would be the best way to do this, since what I've done will never get the legend correct? Please help

clc
clear all
T = readtable('Book1.xlsx');
Time=T.DateTime;
ColumnYouNeed = input('Which variable would you like to plot: ','s');
mask = ismember(T.Properties.VariableNames,ColumnYouNeed);
NewTable = table2array(T(:,mask));
plot(Time,NewTable)
hold on
legend(ColumnYouNeed)
a=input('Would you like to plot another variable? ','s');
while a=='yes'
    ColumnYouNeed = input('Which variable would you like to plot: ','s');
    mask = ismember(T.Properties.VariableNames,ColumnYouNeed);
    NewTable = table2array(T(:,mask));
    plot(Time,NewTable)
    legend(ColumnYouNeed)
    a=input('Would you like to plot another variable? ','s'); 
end

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Answer 1

Cameron B 2020-2-28

0
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在 MATLAB Online 中打开

This may work.

    clc
clear all
 T = readtable('Book1.xlsx');
 Time=T.DateTime;
 ColumnYouNeed = input('Which variable would you like to plot: ','s');
mask = ismember(T.Properties.VariableNames,ColumnYouNeed);
NewTable = table2array(T(:,mask));
 plot(Time,NewTable)
 hold on
 legend(ColumnYouNeed)
 a=input('Would you like to plot another variable? ','s');
cc=2;
 while a=='yes'
    ColumnYouNeed(cc) = input('Which variable would you like to plot: ','s');
    mask = ismember(T.Properties.VariableNames,ColumnYouNeed);
    NewTable = table2array(T(:,mask));
    plot(Time,NewTable)
    legend(ColumnYouNeed)
    a=input('Would you like to plot another variable? ','s'); 
 cc = cc +1;
end

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Viktor G. 2020-2-29

编辑：Viktor G. 2020-2-29

在 MATLAB Online 中打开

Book1.xlsx

I am not sure why but i doesn't work and i keeps giving this error, even though they are the same size. Can you please try it with a simple table?

Error using plot
Vectors must be the same length.
Error in probaodstranata (line 17)
    plot(Time,NewTable)

Cameron B 2020-2-29

在 MATLAB Online 中打开

I got this to work. You’ll have to adapt it, but it should be easy enough. The only issue would be putting decimals, but you wouldn’t be doing that anyway.

    clc
 clear
 aa=gcf;
 delete(aa)
 ColumnYouNeed = input('Which variable would you like to plot: ','s');
 ColumnYouNeedNum =  str2double(ColumnYouNeed);
xx=0:10;
 plot(xx,xx*ColumnYouNeedNum)
 hold on
 legend(ColumnYouNeed)
 a=input('Would you like to plot another variable? ','s');
cc=2;
while strcmp(a,'yes') == 1
    ColumnYouNeed(cc) = input('Which variable would you like to plot: ','s');
    ColumnYouNeedNum(cc) = str2double(ColumnYouNeed(cc));
    plot(xx,xx*ColumnYouNeedNum(cc))
    legend(ColumnYouNeed(:))
    a=input('Would you like to plot another variable? ','s'); 
    cc=cc+1;
end