ERROR in cubic spline interpolation

I have tried this code a thousand times but I get the same error always.

x = [0 0.0901 0.1803 0.2704 0.3606 0.4507 0.5408 0.6310 0.7211 0.8112 0.9014 0.9915 1.0817 1.1718 1.2619 1.3521 1.4422 1.5323 1.6225 1.7126 1.8028 1.8929 1.9830 2.0732 2.1633 2.2534 2.3436 2.4337 2.5239 2.6140 2.7041 2.7943 2.8844 2.9746 3.0647 3.1548 3.2450 3.3351 3.4252 3.5154 3.6055 3.6957 3.7858 3.8759 3.9661 4.0562 4.1463 4.2365 4.3266 4.4168];

y = [ 0 0.0008 0.0031 0.0070 0.0125 0.0195 0.0280 0.0380 0.0496 0.0627 0.0773 0.0934 0.1111 0.1303 0.1512 0.1737 0.1978 0.2236 0.2510 0.2797 0.3095 0.3396 0.3690 0.3965 0.4202 0.4382 0.4488 0.4509 0.4441 0.4292 0.4078 0.3818 0.3529 0.3227 0.2924 0.2627 0.2340 0.2066 0.1804 0.1556 0.1323 0.1104 0.0900 0.0712 0.0540 0.0385 0.0249 0.0135 0.0044 0];

z=linspace(0,1,50);

pp=spline(x,y);

yy=ppval(pp,z);

ERROR : ??? Error using ==> histc Edge vector must be monotonically non-decreasing.

Error in ==> ppval at 67 if lx, [~,index] = histc(xs,[-inf,b(2:l),inf]);

Please help !!!

Answer 1

[Image Analyst]

I copied and pasted and had no error whatsoever:

x = [0 0.0901 0.1803 0.2704 0.3606 0.4507 0.5408 0.6310 0.7211 0.8112 0.9014 0.9915 1.0817 1.1718 1.2619 1.3521 1.4422 1.5323 1.6225 1.7126 1.8028 1.8929 1.9830 2.0732 2.1633 2.2534 2.3436 2.4337 2.5239 2.6140 2.7041 2.7943 2.8844 2.9746 3.0647 3.1548 3.2450 3.3351 3.4252 3.5154 3.6055 3.6957 3.7858 3.8759 3.9661 4.0562 4.1463 4.2365 4.3266 4.4168];
y = [ 0 0.0008 0.0031 0.0070 0.0125 0.0195 0.0280 0.0380 0.0496 0.0627 0.0773 0.0934 0.1111 0.1303 0.1512 0.1737 0.1978 0.2236 0.2510 0.2797 0.3095 0.3396 0.3690 0.3965 0.4202 0.4382 0.4488 0.4509 0.4441 0.4292 0.4078 0.3818 0.3529 0.3227 0.2924 0.2627 0.2340 0.2066 0.1804 0.1556 0.1323 0.1104 0.0900 0.0712 0.0540 0.0385 0.0249 0.0135 0.0044 0];
z=linspace(0,1,50);
pp=spline(x,y);
yy=ppval(pp,z)