求解，这个程序的输入参数是哪些，要输入什么。

function bs = uniformbspline(index,x,sequence)
% 三次均匀B样条插值计算(CBI Cubic B-spline Interpolation)
% bs = uniformbspline(index,x,sequence)
% 输入参数: index 为代求点的横坐标向量(Y的坐标)
% x 已知的点的坐标值
% sequence 所有点的横坐标向量 sequence=1:n;
% 输出参数:
% bs 三次均匀B样条插值结果
% eMail clearsblue@163.com
%
% beta = 1;
% t=0.1; % 可以更改
% p(t) = 1/6*[1 t t^2 t^3]*[0 6 0 0
% -3*beta 0 3*beta 0
% 6*beta -18+3*beta 18-6*beta -3*beta
% -3*beta 12-3*beta -12+3*beta 3*beta ]*[pL;pL1;pL2;pL3]
%
% 数据产生
if(nargin == 1)
error('必须输入两个参数: bs = uniformbspline(index,x)');
end
if length(index) ~=length(x)
error('index,x向量长度不相等!');
end;
% 均匀B样条插值计算
x=[x(1),x];
x=[x(1),x];
x=[x(1),x];
x=[x,x(end)];
x=[x,x(end)];
x=[x,x(end)];
index = [index(1),index];
index = [index(1),index];
index = [index(1),index];
index = [index,index(end)];
index = [index,index(end)];
index = [index,index(end)];
len = length(index);
beta = 0.000001;
ind = 1;
for i = 1:len-3
pL = x(i);
pL1 = x(i+1);
pL2 = x(i+2);
pL3 = x(i+3);
Step = abs((index(i+2)-index(i+1)));
if Step == 0
Step = 1;
end;
k = 0:1/Step:1;
for j = 1:length(k)
t = k(j);
p(ind) = 1/6*[1 t t^2 t^3]*[0 6 0 0
-3*beta 0 3*beta 0
6*beta -18+3*beta 18-6*beta -3*beta
-3*beta 12-3*beta -12+3*beta 3*beta]*[pL;pL1;pL2;pL3];
ind = ind + 1;
end
ind = ind - 1;
end;
p = p(3:end-2);
indexmin = min(index);
if(nargin == 3)
if indexmin < sequence(1)
p = p(abs(indexmin)+2:end);
end;
bs = p(sequence);
else
bs = p;
end;