应《网络安全法》要求，自2017年10月1日起，未进行实名认证将不得使用互联网跟帖服务。为保障您的帐号能够正常使用，请尽快对帐号进行手机号验证，感谢您的理解与支持！

24小时热门版块排行榜    

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
51/1返回列表
查看: 1770  |  回复: 6
只看楼主 @他人 存档 新回复提醒 (忽略) 收藏    在APP中查看
当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

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-');
回复此楼

» 猜你喜欢

» 本主题相关价值贴推荐，对您同样有帮助:

» 抢金币啦！回帖就可以得到:

查看全部散金贴
1楼 2010-12-15 15:49:32
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zmc

金虫 (正式写手)
★ ★ ★ ★
小木虫(金币+0.5):给个红包，谢谢回帖交流
robert2020(金币+3):非常感谢虫友应助！辛苦了！ 2010-12-21 13:08:56
引用回帖:
Originally posted by zyj8119 at 2010-12-19 21:34:06:

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？

恩 对的，具体的方法可以由cflibhelp得到~  祝你好运
For curves:                                                               
    GROUP           DESCRIPTION                                             
    distribution - distribution models such as Weibull                     
    exponential  - exponential function and sum of two exponential functions
    fourier      - up to eight terms of fourier series                     
    gaussian     - sum of up to eight gaussian models                       
    power        - power function and sum of two power functions            
    rational     - rational equation models, up to 5th degree / 5th degree  
    sin          - sum of up to eight sin functions                        
    spline       - splines                                                  
    interpolant  - interpolating models                                    
    polynomial   - polynomial models up to degree nine                     
                                                                           
For surfaces:                                                              
    GROUP           DESCRIPTION                                             
    interpolant  - interpolating models                                    
    polynomial   - polynomial models up to degree five                     
    lowess       - lowess smoothing models                                 
                                                                           
To list only the model equations for a group, type CFLIBHELP               
followed by the group name.                                                
Example:                                                                  
   cflibhelp polynomial                                                     
                                                                           
All models in the Curve Fitting Library:                                   
                                                                           
  DISTRIBUTION MODELS

        MODELNAME             EQUATION

         weibull               Y = a*b*x^(b-1)*exp(-a*x^b)


  EXPONENTIAL MODELS

        MODELNAME             EQUATION

          exp1                 Y = a*exp(b*x)
          exp2                 Y = a*exp(b*x)+c*exp(d*x)


  FOURIER SERIES

        MODELNAME             EQUATION

        fourier1               Y = a0+a1*cos(x*p)+b1*sin(x*p)
        fourier2               Y = a0+a1*cos(x*p)+b1*sin(x*p)+a2*cos(2*x*p)+b2*sin(2*x*p)
        fourier3               Y = a0+a1*cos(x*p)+b1*sin(x*p)+...+a3*cos(3*x*p)+b3*sin(3*x*p)
         ...
        fourier8               Y = a0+a1*cos(x*p)+b1*sin(x*p)+...+a8*cos(8*x*p)+b8*sin(8*x*p)

      where p = 2*pi/(max(xdata)-min(xdata)).


  GAUSSIAN SUMS (Peak fitting)

        MODELNAME             EQUATION

         gauss1                Y = a1*exp(-((x-b1)/c1)^2)
         gauss2                Y = a1*exp(-((x-b1)/c1)^2)+a2*exp(-((x-b2)/c2)^2)
         gauss3                Y = a1*exp(-((x-b1)/c1)^2)+...+a3*exp(-((x-b3)/c3)^2)
         ...
         gauss8                Y = a1*exp(-((x-b1)/c1)^2)+...+a8*exp(-((x-b8)/c8)^2)


  INTERPOLANT

        INTERPTYPE            DESCRIPTION

    Curves & Surfaces:
        linearinterp           linear interpolation
        nearestinterp          nearest neighbor interpolation
        cubicinterp            cubic spline interpolation

    Curves Only:
        pchipinterp            shape-preserving (pchip) interpolation

    Surfaces Only:
        biharmonicinterp       biharmonic (MATLAB 4 griddata) interpolation


  POLYNOMIAL MODELS

        MODELNAME             EQUATION

    Curves:
          poly1                Y = p1*x+p2
          poly2                Y = p1*x^2+p2*x+p3
          poly3                Y = p1*x^3+p2*x^2+...+p4
          ...
          poly9                Y = p1*x^9+p2*x^8+...+p10

    Surfaces:

     Model names for polynomial surfaces are 'polyij', where i is the degree in x
     and j is the degree in y. The maximum for both i and j is five. The degree of
     the polynomial is the maximum of i and j. The degree of x in each term will be
     less than or equal to i, and the degree of y in each term will be less than or
     equal to j. For example:

          poly21               Z = p00 + p10*x + p01*y + p20*x^2 + p11*x*y
          poly13               Z = p00 + p10*x + p01*y + p11*x*y + p02*y^2 + p12*x*y^2 + p03*y^3
          poly55               Z = p00 + p10*x + p01*y +...+ p14*x*y^4 + p05*y^5


  POWER MODELS

        MODELNAME             EQUATION

         power1                Y = a*x^b
         power2                Y = a*x^b+c


  RATIONAL MODELS

     Rational Models are polynomials over polynomials with the leading coefficient
     of the denominator set to 1. Model names are 'ratij', where i is the degree of the
     numerator and j is the degree of the denominator. The degrees go up to five for
     both the numerator and the denominator. For example:

        MODELNAME             EQUATION

          rat02                Y = (p1)/(x^2+q1*x+q2)
          rat21                Y = (p1*x^2+p2*x+p3)/(x+q1)
          rat55                Y = (p1*x^5+...+p6)/(x^5+...+q5)


  SUM OF SINE FUNCTIONS

        MODELNAME             EQUATION

          sin1                 Y = a1*sin(b1*x+c1)
          sin2                 Y = a1*sin(b1*x+c1)+a2*sin(b2*x+c2)
          sin3                 Y = a1*sin(b1*x+c1)+...+a3*sin(b3*x+c3)
          ...
          sin8                 Y = a1*sin(b1*x+c1)+...+a8*sin(b8*x+c8)


  SPLINES

     Spline models are only supported for curve fitting, not for surface fitting

        SPLINETYPE             DESCRIPTION

        cubicspline             cubic interpolating spline
        smoothingspline         smoothing spline


  LOWESS

     Lowess models are only supported for surface fitting, not for curve fitting

        MODELNAME          DESCRIPTION

        lowess               local linear regression
        loess                local quadratic regression
赞一下(2人) 回复此楼
5楼2010-12-20 20:56:45
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 7 个回答

xiegangmai

版主 (职业作家)
★ ★ ★
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
赞一下(2人) 回复此楼
2楼2010-12-15 17:22:16
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

zmc

金虫 (正式写手)
★ ★ ★ ★
小木虫(金币+0.5):给个红包，谢谢回帖交流
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
赞一下(2人) 回复此楼
3楼2010-12-19 21:31:56
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

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？
赞一下 回复此楼
4楼2010-12-19 21:34:06
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 7 个回答
普通表情 龙 兔 虎 猫 高级回复 (可上传附件)
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考博] 售SCI文章，我:8O.5.5.1O.54,科目全,可十急 +4 k0dTPqJtl0jt 2026-08-14 5/250 2026-08-15 04:45 by 4wMiSEwB6436
[找工作] 售SCI文章，我:8O5.5.1.O.54,科目齐全,可+急 +4 k0dTPqJtl0jt 2026-08-14 4/200 2026-08-15 02:21 by 4wMiSEwB6436
[硕博家园] 售SCI一区文章，我:8O5.5.1.O5.4,科目全,可伽急 +3 k0dTPqJtl0jt 2026-08-14 4/200 2026-08-15 01:28 by 4wMiSEwB6436
[基金申请] 各位道友，我要去昆明玩几天，回来见。 +7 Tide man 2026-08-14 8/400 2026-08-15 01:11 by arzu_hma
[考研] 售SCI一区T0P文章，我:8.O.55.1.O.54,科目齐全,可+急 +4 HFw0lei2R37i 2026-08-14 8/400 2026-08-15 00:16 by 4wMiSEwB6436
[基金申请] 咱们一起用铁证分析2026国家社科基金中标与否 +7 启萌科技 2026-08-12 22/1100 2026-08-14 23:45 by Noways
[基金申请] 哪位老哥知道今年的国自然具体哪一天放榜？ +5 Ldrop2023 2026-08-13 5/250 2026-08-14 18:48 by ssxclkj
[基金申请] 应该是93bebmhtak前后十一个字符比较关键 +23 Lanmanbaby 2026-08-09 37/1850 2026-08-14 13:40 by Equinoxhua
[基金申请] filecode +15 documentary 2026-08-10 17/850 2026-08-14 10:08 by kissu88
[文学芳草园] 阿姨 +4 汪汪锅 2026-08-09 4/200 2026-08-13 19:43 by arzu_hma
[基金申请] 重要来源：本周末出结果 +10 瞬息宇宙 2026-08-12 10/500 2026-08-13 15:46 by likettle
[基金申请] 分享一下我之前已中青C的计划书的filecode +4 布布和一二 2026-08-11 5/250 2026-08-13 12:56 by cratir
[基金申请] 结合人工智能，周易传统文化，filecode打分制来了，3分以上希望很大。 +3 Tide man 2026-08-12 4/200 2026-08-13 08:35 by ZJTJZ
[基金申请] 综述论文作为代表作会不会影响评审专家的印象分？ +11 yufeiwaner 2026-08-09 13/650 2026-08-12 08:17 by yufeiwaner
[基金申请] 什么时候出结果，有咨询渠道？？？ +3 Tide man 2026-08-11 3/150 2026-08-11 17:54 by kudofaye
[基金申请] 国自然结果 +4 Vierhys 2026-08-10 8/400 2026-08-10 15:06 by Vierhys
[基金申请] 据悉今年马上要出结果了 +7 瞬息宇宙 2026-08-10 8/400 2026-08-10 12:42 by Vivilian
[基金申请] 2026国自然放榜时间 +9 布布和一二 2026-08-08 9/450 2026-08-10 11:22 by xxxx2020
[基金申请] 面上项目filecode邪修 +5 西山十月 2026-08-09 7/350 2026-08-10 07:32 by 仁砚薪传
[基金申请] 关于filecode，很负责任的告诉大家 +6 爱看书的可乐 2026-08-08 7/350 2026-08-08 22:13 by a_niu
信息提示
关闭
请填处理意见
关闭