[MATLAB基础] 求教高手请教关于积分的输出变量在积分上限谢谢 - MATLAB爱好者论坛-LabFans.com

geraint12 · 2009-05-21, 21:42

m=10:40;
x1=35+10*log(200000);
y1=exp((1/3)*log(100*m/(0.00003-100*x1)));
x=y1+100;
n=(30-30*log(x)+40)/6;
syms n x
z=int(1-(1/15)*exp(-(n.^2/72)),0,x);
axis([10,40,0,1]);
plot(m,z,'r')

输出有问题
??? Error using ==> plot
Conversion to double from sym is not possible.
求教高手帮忙解答谢谢

TTT_IOU · 2009-05-22, 00:06

不太明白你的意思，不过我自己调试了一下程序：
m=10:40;
x1=35+10*log(200000);
y1=exp((1/3)*log(100*m/(0.00003-100*x1)));
k=y1+100;
x=k;
n=(30-30*log(x)+40)/6;
t=1-(1/15)*exp(-(n.^2/72));
syms x
z1=int(t,0,x);
z2=subs(z1,'x',1);
z=z2.*k;
plot(m,z,'r')
axis([10,40,99,99.3])
不知是否是你要的结果，望有帮助！！！

2009-05-21, 21:42	#1
geraint12 初级会员注册日期: 2008-12-03 年龄: 42 帖子: 4 声望力: 0	求教高手请教关于积分的输出变量在积分上限谢谢 m=10:40; x1=35+10log(200000); y1=exp((1/3)log(100m/(0.00003-100x1))); x=y1+100; n=(30-30log(x)+40)/6; syms n x z=int(1-(1/15)exp(-(n.^2/72)),0,x); axis([10,40,0,1]); plot(m,z,'r') 输出有问题 ??? Error using ==> plot Conversion to double from sym is not possible. 求教高手帮忙解答谢谢

2009-05-22, 00:06	#2
TTT_IOU 普通会员注册日期: 2009-02-22 帖子: 91 声望力: 18	回复: 求教高手请教关于积分的输出变量在积分上限谢谢不太明白你的意思，不过我自己调试了一下程序： m=10:40; x1=35+10log(200000); y1=exp((1/3)log(100m/(0.00003-100x1))); k=y1+100; x=k; n=(30-30log(x)+40)/6; t=1-(1/15)exp(-(n.^2/72)); syms x z1=int(t,0,x); z2=subs(z1,'x',1); z=z2.*k; plot(m,z,'r') axis([10,40,99,99.3]) 不知是否是你要的结果，望有帮助！！！