请问一下遇到这个问题怎么解决啊
error: __makeinfo__: could not create temporary file
error: called from
__makeinfo__ at line 137 column 7
__unimplemented__ at line 532 column 9
variational at line 11 column 1
>>


clear;clc;
x1=[0.2 0.4 0.6 0.8 1.0];
y1=[0.98 0.92 0.81 0.64 0.38];
n=length(y1);
c=y1(:);
for j=2:n %求差商
for i=n:-1:j
c(i)=(c(i)-c(i-1))/(x1(i)-x1(i-j+1));
end
end
syms x df d;
df(1)=1;d(1)=y1(1);
for i=2:n %求牛顿差值多项式
df(i)=df(i-1)*(x-x1(i-1));
d(i)=c(i)*df(i);
end
disp('4次牛顿插值多项式');
P4=vpa(collect((sum(d))),5) %P4即为4次牛顿插值多项式，并保留小数点后5位数
pp=csape(x1,y1,'variational');%调用三次样条函数
q=pp.coefs;
disp('三次样条函数');
for i=1:4
S=q(i,:)*[(x-x1(i))^3;(x-x1(i))^2;(x-x1(i));1];
S=vpa(collect(S),5)
end
x2=0.2:0.08:1.08;
dot=[1 2 11 12];
figure
ezplot(P4,[0.2,1.08]);
hold on
y2=fnval(pp,x2);
x=x2(dot);
y3=eval(P4);
y4=fnval(pp,x2(dot));
plot(x2,y2,'r',x2(dot),y3,'b*',x2(dot),y4,'co');
title('4次牛顿插值及三次样条');