How can I plot using a string in MATLAB?
20 views (last 30 days)
Show older comments
I am looking to automate some plotting for work and needing to know how I can take a variable string (string changes based upon selection in MATLAB GUI) and then use that to generate a plot.
Example..
function plotting_fcn(bool1, bool2, boo3)
x1 = [1,2,3,4,5];
y1 = [10,20,30,40,50];
y2 = [20,30,40,50,60];
y3 = [30,40,50,60,70];
y4 = [30,40,50,60,70];
str = 'x, [y1';
if(bool1 == 1)
str = strcat(str, ',y2');
end
if(bool2 == 1)
str = strcat(str, ',y3');
end
if(bool3 == 1)
str = strcat(str, ',y4');
end
str = strcat(str, '];');
% HOWEVER I CAN CONVERT str INTO SOMETHING THAT CAN BE PLOTTED.
plot(x, str)
end
If there is another way to do this I am all ears (eyes), but I don't want to have to create plotting code for each of the 3! scenarios that exist for this plot.
Please Help,
Thanks,
Kellen
3 Comments
Andrew Newell
on 5 Mar 2015
The variable x isn't defined. Do you mean x1? Also, y3 and y4 are identical. Should they be?
Answers (3)
Andrew Newell
on 5 Mar 2015
Edited: Andrew Newell
on 5 Mar 2015
It's not necessary to have all those conditional statements. Just use indexing:
function plotting_fcn(idx)
% Note: idx could be Boolean or it could be one or more numbers between 1
% and 4.
x = [1,2,3,4,5];
y = [10,20,30,40,50; ...
20,30,40,50,60; ...
30,40,50,60,70; ...
30,40,50,60,70];
plot(x, y(idx,:))
end
You could plot the second curve using
plotting_fcn([false true false false])
or
plotting_fcn(2)
3 Comments
Andrew Newell
on 5 Mar 2015
Strings are still a clumsy way of doing it. Given the revised statement of the problem, I would suggest
function varargout = reporting_GUI(varargin)
function run_btn_Callback(hObject, eventdata, handles)
choices = ([1 checkbox1 checkbox2 checkbox3] == 1);
plt_str(choices)
end
function plt_str(choices)
x1 = [1,2,3,4,5];
y = [10,20,30,40,50; ...
20,30,40,50,60; ...
30,40,50,60,70; ...
40,50,60,70,80];
plot(x1,y(choices,:))
end
Now it's robust. Note that now the first element in choices is always 1, which answers your second objection.
Andrew Newell
on 5 Mar 2015
For completeness, here is how to do it with a string:
eval(['plot(',str,')'])
David Barry
on 5 Mar 2015
function plotting_fcn(bool1, bool2, bool3)
x1 = [1,2,3,4,5];
y1 = [10,20,30,40,50];
y2 = [20,30,40,50,60];
y3 = [30,40,50,60,70];
y4 = [30,40,50,60,70];
data = y1;
if(bool1 == 1)
data = [data; y2];
end
if(bool2 == 1)
data = [data; y3];
end
if(bool3 == 1)
data = [data; y4];
end
plot(x1, data)
end
4 Comments
David Barry
on 5 Mar 2015
Edited: David Barry
on 5 Mar 2015
I just went on what you gave and solved the problem in hand. It's not clear from your description exactly what you are trying to do. I suggest including the actual code and an example of the struct you are passing as an input to the plotting function.
Oran Levi
on 26 Apr 2021
function [text] = lines_intersect(str1,str2)
%UNTITLED4 Summary of this function goes here
% Detailed explanation goes here
x=linspace(-10,10)
plot(x,str1,'r-',x,str2,'g-')
plot(,,'r*')
xlabel('x');
ylabel('y');
0 Comments
See Also
Categories
Find more on Data Type Identification in Help Center and File Exchange
Products
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!