谁能回答我的问题，版主给您奖励300金币。（见论坛首页上部）
难道真的没有人肯帮忙吗？

这是我做的第一道题的答案，第二道题涉及到循环（loop）使用，看来不太好对付，希望专家指点！
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% the program is written for the Exl_1a
% the estimated polynomial function form is: N(t)=a_0+a_1*t+a_2*t^2+a_3*t^3+a_4*t^4
% show the estimated results in the figure

% "t" is year and "A" the population  
t=[0 10 25 50 75 85 ];
A=[1 1.08 1.201 1.475 1.750 1.890];
 
% Derive the population between 0 and 150 based on t and A
coeff=polyfit(t, A, 4);
eval_time=0:10:150;
Growth_function=polyval(coeff, eval_time);
% Plot the result of the polynomial and the measured values of the
% population in the same figure
plot(eval_time, Growth_function, 'r')
hold on
plot(t, A, '*b')
% add legend and title
legend('Result of polynominal','Measured Population')
xlabel('Year')
ylabel('Growth rate')
title('Population')

% end of the program

该收假了吧，高人在哪里？