MATLAB: Unable to plot multiple fplot3 plots in a single figure window

3d plotsfigurefplotfplot3hold onMATLAB

I want to plot these three bezier curves in a single figure window, But only the first one gets plotted whichever among the three is first written. 'biu' is a function which returns a scalar value coresponding to x, y and z coordinate.
fplot3(@(u) biu(6,u,answer6(i,:),1), @(u) biu(6,u,answer6(i,:),2), @(u) biu(6,u,answer6(i,:),3), [0,1]);
hold on
fplot3(@(u) biu(8,u,answer8(i,:),1), @(u) biu(8,u,answer8(i,:),2), @(u) biu(8,u,answer8(i,:),3), [0,1]);
fplot3(@(u) biu(10,u,answer10(i,:),1), @(u) biu(10,u,answer10(i,:),2), @(u) biu(10,u,answer10(i,:),3), [0,1]);
Also, a warning occurs while executing second and third fplot3.
Warning: Error updating ParameterizedFunctionLine.
The following error was reported evaluating the function in FunctionLine update: Matrix dimensions
must agree.
 
> In defaulterrorcallback (line 12)
  In continous_plot (line 26)
I am attaching the following executable code:
1;
clear
answer6 = [0.100000000000000	-6.21416331569629e-24	-4.50067222307376e-22	2.74750257593135e-23	0.190477327063510	-6.21416331569630e-24	-4.50067222307376e-22	-10.9260818385908	0.250945795757658	-0.0451689735762751	0.0283457843799247	4.03424843193981	0.173917713362077	-0.140836185200614	-0.390991522770315	-0.605005655409602	-0.0406952485790888	-0.174065964740236	0.371284463498887	-2.84477235804700	0.196423091290018	-3.53805043409145e-23	4.00422535274886e-22	0.180754593067727	0.900000000000000	-3.53805043409148e-23	4.00422535274886e-22	0];
answer8 = [0.100000000000000	-7.06472172696455e-22	-1.72925923497761e-20	-6.97358948464362e-22	0.177119941643678	-7.06472172696457e-22	-1.72925923497761e-20	-26.7913589675177	-0.0246464915517595	-0.00262781158023573	-0.000248137776663395	18.5819139350985	0.792166611629705	0.00592149397069832	-0.0575361342079896	-23.9883460477526	0.212949051718266	0.618648449540250	0.264002935566575	1.05316519470157	0.608822639612242	-0.468662052642181	-0.943037679532112	0.123977640513716	0.542232586158068	-0.180255361839493	0.539315234478191	-6.25709650240297	0.565731359548267	-3.16930293664645e-20	-2.73778470569392e-21	-0.212430190468469	0.900000000000000	-3.16930293664646e-20	-2.73778470569392e-21	0];
answer10 = [0.100000000000000	7.44976336488981e-26	-2.72925178012477e-25	0	0.341660364019771	-8.36334207627696e-26	6.03638566286587e-25	-0.0821226164675251	-0.116018472518371	0.275797408817403	0.483984092069014	0.357820148354801	-0.309601667970325	-0.427475712037463	-0.861659197808978	-2.75583808235523	1.33580907738058	0.348144691156665	0.871698466222378	0.918537941545163	-1.28737948991171	-0.146081700272931	-0.588205568764831	1.44289605927306	1.14034147857000	-0.00384025271401972	0.242081990228206	-17.1532035902660	-0.711184991677660	0.0123546743275213	-0.0714870713918044	9.86110330591459	1.46372097562677	-0.00978612652148374	0.0133995593293546	-5.07578699742636	-0.0228631835799416	3.00318624836592e-24	1.22747896244737e-23	0.0698643052915244	0.900000000000000	2.17310703266423e-24	-7.62659438731673e-25	0];
s = length(answer6(:,1));
figure();
for i=1:s
    fplot3(@(u) biu(6,u,answer6(i,:),1), @(u) biu(6,u,answer6(i,:),2), @(u) biu(6,u,answer6(i,:),3), [0,1]);
    hold on
    fplot3(@(u) biu(8,u,answer8(i,:),1), @(u) biu(8,u,answer8(i,:),2), @(u) biu(8,u,answer8(i,:),3), [0,1]);
    fplot3(@(u) biu(10,u,answer10(i,:),1), @(u) biu(10,u,answer10(i,:),2), @(u) biu(10,u,answer10(i,:),3), [0,1]);
    hold off
end
function b = biu(n,u,r,d)
persistent NC NCI
if isempty(NC)
    NCI=zeros(n+1,1);
    for i=0:n
        NCI(i+1) = nchoosek(n,i);
    end
    NC=1;
end
b=0;
for i=0:n
    b=b+NCI(i+1)*(u.^i).*(1-u).^(n-i).*r(4*i+1:4*i+4);
end
if d~=0
    b=b(d);
end
end

Best Answer

After first using of fplot3 you have NCI variable (size 7x1)
Second time you are trying to use fplot3 you should have NCI of size 9x1, but you declared it as persistent
Try to clear all persistent variables after using of fplot3
fplot3(...)
clear functions
fplot3(...)
clear functoins
fplot3(...)
I saved biu as a separate file-function and used ezplot3
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