版块导航: 正在加载中...

登录注册

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

返回列表

zyj8119

木虫 (著名写手)

应助: 65 (初中生)
贵宾: 0.003
金币: 915.1
帖子: 2936
在线: 1329.4小时
虫号: 664177

[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

有时候真觉得大城市人没有县城人甚至个体户幸福已经有11人回复
表哥与省会女结婚，父母去帮带孩子被省会女气回家生重病了已经有7人回复
同年申请2项不同项目，第1个项目里不写第2个项目的信息，可以吗已经有8人回复
依托企业入选了国家启明计划青年人才。有无高校可以引进的。已经有7人回复
依托企业入选了国家启明计划青年人才。有无高校可以引进的。已经有10人回复
天津大学招2026.09的博士生，欢迎大家推荐交流（博导是本人）已经有9人回复
有院领导为了换新车，用横向课题经费买了俩车已经有10人回复
AI 太可怕了，写基金时，提出想法，直接生成的文字比自己想得深远，还有科学性已经有6人回复

» 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

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)

应助: 1 (幼儿园)
金币: 972.6
帖子: 336
在线: 187.7小时
虫号: 761414

★ ★ ★ ★
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)

应助: 65 (初中生)
贵宾: 0.003
金币: 915.1
帖子: 2936
在线: 1329.4小时
虫号: 664177

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

zmc

金虫 (正式写手)

应助: 1 (幼儿园)
金币: 972.6
帖子: 336
在线: 187.7小时
虫号: 761414

★ ★ ★ ★
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

zyj8119

木虫 (著名写手)

应助: 65 (初中生)
贵宾: 0.003
金币: 915.1
帖子: 2936
在线: 1329.4小时
虫号: 664177

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！！！！

回复此楼

6楼2010-12-20 20:59:18

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖