String scalar or character vector must have valid interpreter syntax?

Hello.

I am trying to make a legend for a plot, but i get the error 'String scalar or character vector must have valid interpreter syntax'. The code is showed below.

m = 4;
legend(['Lagrange, {\itp}_{' num2str(m) '}({\itx})'],'Interpolated points','Discrete points','location','best') ;

Can someone tell me what to do? :-)

[Stephen23]

What MATLAB version are you using?

plot(1:5,rand(5,3))
m = 4;
t = ['Lagrange, {\itp}_{' num2str(m) '}({\itx})']

t = 'Lagrange, {\itp}_{4}({\itx})'

legend(t,'Interpolated points','Discrete points','location','best')

[Tobias Frederiksen]

I think it is MATLAB R2020b. Should i update it?

Answer 1

[Nirupama]

Hi @Tobias Frederiksen,

I ran the following lines of code in MATLAB R2020b and did it not throw any error (as you mentioned in the comments that you were using MATLAB R2020b):

plot(1:5,rand(5,3))
m = 4;
legend(['Lagrange, {\itp}_{' num2str(m) '}({\itx})'],'Interpolated points','Discrete points','location','best') 

I do not think it an issue related to MATLAB R2020b. I would recommend you to clear the workspace and command window and retry executing the above lines of code.

Hope this helps!