How to use loop for plotting multiple plots and legend?

I want to plots mulplits plots on and I have single x time axis and temp1 upto temp20 similalry so how to use loop here for labeling the legend and plots instead of writing for 20 times.

t=readtable ()
plot (t.time,t.temp1, .t.time,temp20)
legend ("Temp1",....,"Temp2")

Answer 1

[Dyuman Joshi]

What you want to do is possible but quite more tedious than what you did.

y=readtable('test file.xlsx');
z=cell(1,20);
for i=1:20
    z{i}=sprintf('temp%d', i); %collecting legend labels in a cell array
    plot(table2array(y(:,'Time')),table2array(y(:,z{i})))
    hold on
end
hold off
legend(z,'Location', 'best','FontSize',6 , 'NumColumns',4)

Answer 2

[Arshey Dhangekar]

How to vary colors because it's difficult to identify the parameters. Any suggestions

[Dyuman Joshi]

And how exactly do you want to do that?

[Arshey Dhangekar]

Temp 1 and temp 15 have same plot colors and similarly other plots also so it's hard differentiate the plots. So how to vary colors so that every temp1 to temp 20 will have different color or shade

[Dyuman Joshi]

You can use rand() (which I guess is the default option as well) to obtain different colors. Though there's a chance that 2 or more colors seem similar, for eg -

x=0:0.01:10;
for i=1:20
plot(x,sin(x).^i,'Color',rand(1,3))
z{i}=sprintf('sin^{%d} x', i);
hold on
end
legend(z,'Location', 'best','FontSize',6 , 'NumColumns',4)

%11-13, 16-18 look similar

Or you can define particular array for it, to distinguish better in between colors.

A random example -

y = (dec2base(0:19,3)-'0')/2;
figure
for i=1:20
plot(x,cos(x).^i,'Color',y(i,:))
z{i}=sprintf('cos^{%d} x', i);
hold on
end
legend(z,'Location', 'best','FontSize',6 , 'NumColumns',4)