EB 2.3 KL一AD double wall corrugated board,好像是纸箱规格什么的

EB 2.3 KL一AD double wall corrugated board,好像是纸箱规格什么的 Matlab求助!问题出现是Conversion to double from sym is not possible.syms t p a km kh kl t=0:1:20 p=0.1 a=0.5 kh=100 km=80 kl=60 y1=1-(1-p).^t.*(kh*kl.*exp(a.*y1.*kh.*t)./(kl.*exp(a.*y1.*kh.*t)-kl+kh)-kl)/(kh-kl)y2=1-(1-p).^t.*(kh*km.*exp(a.*y2. double double double double double double double double Double double double double double double double double