SCRIPT error using convhull command

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milad babaei
milad babaei 2011-10-27
Hi, would anyone please help me to correct that error or find a way to plot curves to follow both edges of data (up and bottom of set of data),my script :
nsamples=1000;
for i=1:nsamples
CS(i)=C(1,i);
phi(i)=((14.1477*CS(i)*CS(i))-(28.512*CS(i)) +16.4557);
end
k = convhull( CS(i), phi(i));
plot( CS(K), phi(K),'r0',CS,phi,'b+')
grid on
xlabel('cohesion (kg/cm^2)'),ylabel('phi(degree)')
[ cs values must first call from a random numb. generator.then plotting set of cs vs phi on a x-y area...then need to plot curves to follow both edges of data ] and the errors :
??? Error using ==> cgprechecks at 47 Not enough unique points specified.
Error in ==> convhulln at 42 cgprechecks(x, nargin, cg_opt);
Error in ==> convhull at 42 [k,v] = convhulln([x(:) y(:)]);
Error in ==> pltcphi2 at 6 k = convhull( CS(i), phi(i));

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回答（1 个）

Jan
Jan 2011-10-27
This calls CONVHULL with two scalars:
k = convhull(CS(i), phi(i))
Of course it is hard to find a hull for this. Do you mean:
k = convhull(CS, phi)
?
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milad babaei
milad babaei 2011-10-28
ABOVE error appear when using CONvHULL....don't know how solve it??
Jan
Jan 2011-10-28
Which one is the "ABOVE error"? The "??? Undefined function or variable 'K'" error appears in the line *after* the CONVHULL. This looks like CONVHULL has been processed successfully.
If you want more help, it would be necessary to explain, if my idea of changing "CS(i)" to "CS" had any effects.

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