legend of a variable matlab code example

Example 1: add variable to legend matlab

str = {strcat('z = ' , num2str(z))}  % at the end of first loop, z being loop output
str = [str , strcat('z = ' , num2str(z))] % after 2nd loop
% plot your data
legend(str{:})

Example 2: legend matlab

x = linspace(0,10);
y1 = sin(x);
y2 = sin(0.9*x);
y3 = sin(0.8*x);
y4 = sin(0.7*x);
y5 = sin(0.6*x);
y6 = sin(0.5*x);

plot(x,y1,'DisplayName','sin(x)')
hold on
plot(x,y2,'DisplayName','sin(0.9x)')
plot(x,y3,'DisplayName','sin(0.8x)')
plot(x,y4,'DisplayName','sin(0.7x)')
plot(x,y5,'DisplayName','sin(0.6x)')
plot(x,y6,'DisplayName','sin(0.5x)')
hold off

lgd = legend;
lgd.NumColumns = 2;