# Creating legend from fittype function

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Ran Kagan on 30 May 2022
Commented: Ran Kagan on 30 May 2022
Hi,
I've been trying to create legends for numerous curves I plotted (using fittype/fit functions) on the same graph, but with no success.
All "legend" functions didn't seem to work like I wanted. See my code below with my "%"s as my trial and erros.
Would apprecaite your help in this matter!
Thanks.
x_alpha = [0,2,5];
SF_alpha=[1, 0.0505, 0.02971];
SF_alpha_TMZ=[0.4347, 0.03565, 0.01657];
x_gamma = [0,2,5];
SF_gamma=[1,0.43571,0.07857];
SF_gamma_TMZ=[0.67142,0.35428,0.04642];
% Alpha
g=fittype('exp1');
myfit=fit(x_alpha',SF_alpha',g)
hL1=plot(myfit, x_alpha, SF_alpha)
xlim([0 5.5])
hold on
myfit1=fit(x_alpha',SF_alpha_TMZ',g)
hL2=plot(myfit1, x_alpha, SF_alpha_TMZ)
% Gamma
m=fittype('exp(-a*x-b*x^2)');
myfit2=fit(x_gamma',SF_gamma',m)
hL3=plot(myfit2, x_gamma, SF_gamma)
myfit3=fit(x_gamma',SF_gamma_TMZ',m)
hL4=plot(myfit3, x_gamma, SF_gamma_TMZ)
hold off
set([hL1(2)],'color','k')
set([hL2(2)] ,'color','b')
set([hL3(2)] ,'color','m')
set([hL4(2)] ,'color','r')
%h=[hL1;hL2;hL3;hL4];
%legend(h,'Alpha SF','Alpha SF+TMZ','Gamma SF','Gamma SF+TMZ');
%legend([hL1;hL2;hL3;hL4], 'Alpha SF','Alpha SF+TMZ','Gamma SF','Gamma SF+TMZ')
%legend(h, {'Alpha SF','Alpha SF+TMZ','Gamma SF','Gamma SF+TMZ'}, 'Location', 'BestOutside')
set(gca, 'YScale', 'log')

KSSV on 30 May 2022
hL1=plot(myfit, x_alpha, SF_alpha) ;
use:
xi = linspace(min(x_alpha),max(x_alpha)) ;
hL1=plot(xi,myfit(xi), x_alpha, SF_alpha)
And use legend.
Ran Kagan on 30 May 2022
Hi,
I tried using your suggested lines but it draws linear lines rather than using the "exp1" and the second exponent function I wanted.
I suppose there's a method to create the legend simply by using the legend syntax correctly without changing the code itself?