Too many input arguments Error using Polyfit..HELP!!!

global I1 I2 P SynM s G D L Polar k; 
 
I1=200;                 % Moment of intertia of motor (kgm^2)
I2=3000;                % Moment of intertia of fan (kgm^2)
P=1000000;              % Motor Power
SynM=1500;              % Motor synchronous speed RPM 
s=0.05;                 % Motor slip
G=80000000000;          % Shaft modulus of Rigidity
D=0.2;                  % Shaft Diameter
L=1;                    % Shaft Length
Polar=0.0001571;        % (pi*(D^4)/32) – Polar moment of Inertia
k=12568000;             % stiffness = (G*J)/L
t0=0;                   % start time of simulation
tf=60;                  % end time of simulation
 
 
Tf1=P/((2*pi/60)*((1-s)*SynM));	
% Torque with full load
M=[0; 20; 40; 60; 65; 70; 75; 80; 85; 90; 95; 100];
% percentage of motor synchronous speed
T=[150; 176; 212; 268; 282; 289; 296; 290; 262; 200; 100; 0];  
% percentage of torque with full load
Tm=Tf1.*(T./100);                                               
% Torque motor in N.m
Tf=(0.0033).*(((SynM*(2*pi/60)).*(M./100)).^2);                 
% Torque fan in N.m             
 
 
P1=polyfit(((SynM*(2*pi/60)).*(M./100)),Tm,6);                   
% Coefficient %Pm=polyval(P,Sm); % value of y axis
P2=polyfit(((SynM*(2*pi/60)).*(M./100)),Tf,4);                  
% Pf=polyval(P2,Sm);
 
 
x=[0; 0; 0; 0];                                                 
% initial value for z_dot in assignment_function
options=odeset('abstol',1e-6,'reltol',1e-6);                    
% set value to -6 maximum
[t,z]=ode45('assignment_function',[t0 tf],x,options);           
% used ode45 function
 
 
plot(t,z); % plot graph
 
subplot(2,1,1);
plot(t,z(:,2),'r',t,z(:,4),'g');
grid;
title('Angular Velocity against Time');
xlabel('Time (s)');
ylabel('Angular Velocity (rad/s)');
legend('Motor','Fan');
 
subplot(2,1,2);
plot(t,z(:,1)-z(:,3));
grid;
title('Angle of Twist against Time');
xlabel('Time (s)');
ylabel('Angle of Twist (Rad)');
legend('Angle of twist');

Error using polyfit

Too many input arguments.

Error in Testrun (line 30)

P2=polyfit(((SynM*(2*pi/60)).*(M./100)),Tf,4);

[KSSV]

Check the dimensions of input. You have to input 1D arrays...Read the documentation.

[Danish Teo]

Does this mean i Cant put any Matrix inside?

[KSSV]

There is no error with the polyfit with shown code.

[Danish Teo]

But the error still persists.. I cant solve it..

[Bruno Luong]

Can you tell us what is result of

which polyfit

[Danish Teo]

There is no results.. it just Displays ' Too many input argument ' Error

[KSSV]

@Danish Type

which polyfit 

in workspace and tell us what it shows up. This is what Bruno Luong meant. We suspect that there might be a user defined polyfit function. You are using that instead of inbuilt function.

[Danish Teo]

>> which polyfit 
D:\mATLAB\toolbox\matlab\polyfun
\polyfit.m

This is the Results

[KSSV]

The function is inbuilt function.....Are you sure the given code you are running? I am getting the following error when I run your code.

global I1 I2 P SynM s G D L Polar k; 
 
I1=200;                 % Moment of intertia of motor (kgm^2)
I2=3000;                % Moment of intertia of fan (kgm^2)
P=1000000;              % Motor Power
SynM=1500;              % Motor synchronous speed RPM 
s=0.05;                 % Motor slip
G=80000000000;          % Shaft modulus of Rigidity
D=0.2;                  % Shaft Diameter
L=1;                    % Shaft Length
Polar=0.0001571;        % (pi*(D^4)/32) – Polar moment of Inertia
k=12568000;             % stiffness = (G*J)/L
t0=0;                   % start time of simulation
tf=60;                  % end time of simulation
 
 
Tf1=P/((2*pi/60)*((1-s)*SynM));	
% Torque with full load
M=[0; 20; 40; 60; 65; 70; 75; 80; 85; 90; 95; 100];
% percentage of motor synchronous speed
T=[150; 176; 212; 268; 282; 289; 296; 290; 262; 200; 100; 0];  
% percentage of torque with full load
Tm=Tf1.*(T./100);                                               
% Torque motor in N.m
Tf=(0.0033).*(((SynM*(2*pi/60)).*(M./100)).^2);                 
% Torque fan in N.m             
 
 
P1=polyfit(((SynM*(2*pi/60)).*(M./100)),Tm,6);                   
% Coefficient %Pm=polyval(P,Sm); % value of y axis
P2=polyfit(((SynM*(2*pi/60)).*(M./100)),Tf,4);                  
% Pf=polyval(P2,Sm);
 
 
x=[0; 0; 0; 0];                                                 
% initial value for z_dot in assignment_function
options=odeset('abstol',1e-6,'reltol',1e-6);                    
% set value to -6 maximum
[t,z]=ode45('assignment_function',[t0 tf],x,options);           

Error using feval
Unrecognized function or variable 'assignment_function'.

Error in odearguments (line 90)
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.

Error in ode45 (line 115)
odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

% used ode45 function
 
 
plot(t,z); % plot graph
 
subplot(2,1,1);
plot(t,z(:,2),'r',t,z(:,4),'g');
grid;
title('Angular Velocity against Time');
xlabel('Time (s)');
ylabel('Angular Velocity (rad/s)');
legend('Motor','Fan');
 
subplot(2,1,2);
plot(t,z(:,1)-z(:,3));
grid;
title('Angle of Twist against Time');
xlabel('Time (s)');
ylabel('Angle of Twist (Rad)');
legend('Angle of twist');

[Danish Teo]

Does the Matlab version matter?.. I am using the same code and the Same "Too many input argument " Error Persists..

[KSSV]

Polyfit remains same in all the version according my knowledge.

[Walter Roberson]

When the error occurs please tell us class() of each of the variables mentioned in the line that is causing the problem.

[Danish Teo]

ans =

    'double'

The class are all 'Doubles'

[Walter Roberson]

Please

edit polyfit

and show us what the first line of the file is.

[Danish Teo]

function x_dot=LSCA1(t,x)
 
clc;
 
global Im If k P P2;
 
x_dot(1)=x(2);
x_dot(2)=((k/Im)*x(3))-((k/Im)*x(1))+(polyval(P,x(2))/Im);
x_dot(3)=x(4);
x_dot(4)=((k/If)*x(1))-((k/If)*x(3))-(polyval(P2,x(4))/If);
 
x_dot=x_dot';

[Walter Roberson]

Could you confirm that is what you get when you ask to edit polyfit? Because that is not even close to the right function.

Please also try

edit D:\mATLAB\toolbox\matlab\polyfun\polyfit.m

to verify that you really have overwritten the Mathworks version

[Danish Teo]

function x_dot=assignment_function(t,x)
 
clc;
 
global Im If k P P2;
 
x_dot(1)=x(2);
x_dot(2)=((k/Im)*x(3))-((k/Im)*x(1))+(polyval(P,x(2))/Im);
x_dot(3)=x(4);
x_dot(4)=((k/If)*x(1))-((k/If)*x(3))-(polyval(P2,x(4))/If);
 
x_dot=x_dot';

This is the correct one

[Danish Teo]

How do i Return the function to normal if i have overwritter my matlab Polyfit function?

[Bruno Luong]

• With luck you might have a copy polyfit.asv (but as we ask you to edit the file, it's no longer contains the original code).
• Reinstall MATLAB.
• Ask someone who has an intact installation to give you a file (though this is not totally legal to do).

[Danish Teo]

Thank you for the solution..It is Repaired my fellow mates

Answer 1

[Danish Teo]

Reinstalled.. Works Perfectly Fine now..