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% 下面三条命令完全等价 r = maple('evalf(Pi,20)') maple evalf Pi 20 r = maple('evalf','Pi',20)

t=0:pi/50:2*pi; r=sin(t).*cos(t); polar(t,r,'-*');

syms a x;f=a*sin(x)+5; f1=subs(f,'sin(x)',sym('y')) % f2=subs(f,{a,x},{2,sym(pi/3)}) % f3=subs(f,{a,x},{2,pi/3}) % f4=subs(subs(f

y1=2*sin(0.3*pi)/(1+sqrt(5)) y2=2*cos(0.3*pi)/(1+sqrt(5))

clear,t=pi;cem='[t/2,t*2,sin(t)]';y=eval(cem)

clear,t=pi;cem='[t/2,t*2,sin(t)]';y=eval(cem)

function y=normal(x) y=(1/(2*pi)^0.5)*exp(-x.^2/2);

% 数值积分 S=quad('esin',0,3*pi)

t=0:pi/50:2*pi; r=sin(t).*cos(t); polar(t,r,'-*');

syms a x;f=a*sin(x)+5; f1=subs(f,'sin(x)',sym('y')) % f2=subs(f,{a,x},{2,sym(pi/3)}) % f3=subs(f,{a,x},{2,pi/3}) % f4=subs(subs(f