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小木虫论坛-学术科研互动平台 » 计算模拟区 » 仿真模拟 » MATLAB » 【求助】MATLAB错误
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zyj8119

木虫 (著名写手)

[交流] 【求助】MATLAB错误

CODE:
function CO2
clc;
x=[10,20,30,40,50,60,70,80,90,100];
y1=[0.011,0.013,0.015,0.022,0.026,0.031,0.031,0.033,0.039,0.045];
y2=[0.011,0.012,0.021,0.024,0.027,0.040,0.042,0.042,0.042,0.049];
y3=[0.012,0.017,0.021,0.032,0.035,0.039,0.040,0.041,0.047,0.053];
y4=[0.011,0.015,0.023,0.027,0.035,0.039,0.042,0.049,0.051,0.055];
plot(x,y1,'gx')
hold on
plot(x,y2,'b*')
hold on
plot(x,y3,'r+')
hold on
plot(x,y4,'mo')
xlabel('total pressure(kpa)');ylabel('adsorption capacity(mmol/g)');
yy1=fit(x',y1','smoothingspline');
yy2=fit(x',y2','smoothingspline');
yy3=fit(x',y3','smoothingspline');
yy4=fit(x',y4','smoothingspline');
plot(x,yy1,'g-');
hold on
plot(x,yy2,'b-')
hold on
plot(x,yy3,'r-')
hold on
plot(x,yy4,'m-')
legend('MCM-41 without APTS','MCM-41 with 15APTS','MCM-41 with 30APTS',...
    'MCM-41 with 45APTS');
hold off
end

为什么此程序运行会出现这个错误：
??? Error using ==> diff
Function 'diff' is not supported for class 'cfit'.

Error in ==> cfit.plot at 65
   if any(diff(xdata)<0)

Error in ==> CO2 at 20
plot(x,yy1,'g-');
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1楼 2010-12-15 15:49:32
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zyj8119

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引用回帖:
Originally posted by zmc at 2010-12-20 20:56:45:


恩 对的，具体的方法可以由cflibhelp得到~  祝你好运
For curves:                                                               
    GROUP           DESCRIPTION                                   ...

谢谢支持！！！！
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6楼2010-12-20 20:59:18
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xiegangmai

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★ ★ ★
zyj8119(金币+1):谢谢参与
zyj8119(金币+19):谢谢提醒！ 2010-12-15 18:25:29
robert2020(金币+2):多谢应助！ 2010-12-16 09:19:36
[quote]Originally posted by zyj8119 at 2010-12-15 15:49:32:
CODE:
function CO2
clc;
x=[10,20,30,40,50,60,70,80,90,100];
y1=[0.011,0.013,0.015,0.022,0.026,0.031,0.031,0.033,0.039,0.045];
y2=[0.011,0.012,0.021,0.024,0.027,0.040,0.042,0.042,0.042,0.049];
... [/quote]

[code]
function CO2
clc;
x=[10,20,30,40,50,60,70,80,90,100];
y1=[0.011,0.013,0.015,0.022,0.026,0.031,0.031,0.033,0.039,0.045];
y2=[0.011,0.012,0.021,0.024,0.027,0.040,0.042,0.042,0.042,0.049];
y3=[0.012,0.017,0.021,0.032,0.035,0.039,0.040,0.041,0.047,0.053];
y4=[0.011,0.015,0.023,0.027,0.035,0.039,0.042,0.049,0.051,0.055];
plot(x,y1,'gx')
hold on
plot(x,y2,'b*')
% hold on
plot(x,y3,'r+')
% hold on
plot(x,y4,'mo')
xlabel('total pressure(kpa)');ylabel('adsorption capacity(mmol/g)');
yy1=fit(x',y1','smoothingspline');
yy2=fit(x',y2','smoothingspline');
yy3=fit(x',y3','smoothingspline');
yy4=fit(x',y4','smoothingspline');
% plot(x,yy1,'g-');
% hold on
% plot(x,yy2,'b-')
% hold on
% plot(x,yy3,'r-')
% hold on
% plot(x,yy4,'m-')
plot(yy1,'g-');
plot(yy2,'b-');
plot(yy3,'r-');
plot(yy4,'m-');
legend('MCM-41 without APTS','MCM-41 with 15APTS','MCM-41 with 30APTS',...
    'MCM-41 with 45APTS');
hold off
end
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2楼2010-12-15 17:22:16
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zmc

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robert2020(金币+3):多谢应助！ 2010-12-29 09:05:21
fit 函数的返回结果并不是实数，而是cfit object cfun，故作图的时候会出错，应改为：
function CO2
clc;
x=[10,20,30,40,50,60,70,80,90,100];
y1=[0.011,0.013,0.015,0.022,0.026,0.031,0.031,0.033,0.039,0.045];
y2=[0.011,0.012,0.021,0.024,0.027,0.040,0.042,0.042,0.042,0.049];
y3=[0.012,0.017,0.021,0.032,0.035,0.039,0.040,0.041,0.047,0.053];
y4=[0.011,0.015,0.023,0.027,0.035,0.039,0.042,0.049,0.051,0.055];
plot(x,y1,'gx')
hold on
plot(x,y2,'b*')
hold on
plot(x,y3,'r+')
hold on
plot(x,y4,'mo')
xlabel('total pressure(kpa)');ylabel('adsorption capacity(mmol/g)');
yy1=fit(x',y1','smoothingspline');
yy2=fit(x',y2','smoothingspline');
yy3=fit(x',y3','smoothingspline');
yy4=fit(x',y4','smoothingspline');
plot(yy1,'g-');
hold on
plot(yy2,'b-')
hold on
plot(yy3,'r-')
hold on
plot(yy4,'m-')
legend('MCM-41 without APTS','MCM-41 with 15APTS','MCM-41 with 30APTS',...
    'MCM-41 with 45APTS');
hold off
end
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3楼2010-12-19 21:31:56
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zyj8119

木虫 (著名写手)
引用回帖:
Originally posted by zmc at 2010-12-19 21:31:56:
fit 函数的返回结果并不是实数，而是cfit object cfun，故作图的时候会出错，应改为：
function CO2
clc;
x=[10,20,30,40,50,60,70,80,90,100];
y1=[0.011,0.013,0.015,0.022,0.026,0.031,0.031,0.033,0.039, ...

谢谢，我想问一下，假如是使用别的拟合方式，是不是只要把smoothspline换成需要的就好？
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4楼2010-12-19 21:34:06
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