MATLAB error Undefined function or method X for input arguments of type double

Question

I m a new user of Matlab  can you please help  I have the following code in an  M file   function f   divrat w  C  S sqrt diag diag C     s diag S   f sqrt w  C w   w  s     I have stored this file  divrat M  in the normal Matlab path  and therefore I m assuming that Matlab will read the function when it s starting and that this function therefore should be available to use   However  when I type   gt  gt  divrat w  C    I get the following error         Undefined function or method  divrat  for input arguments of type  double       What is the error message telling me to do  I can t see any error in the code or the function call

User · Answer

The error code indicates the function definition cannot be found. Make sure you're calling the function from the same workspace as the divrat.m file is stored. And make sure divrat function is not a subfunction, it should be first function declaration in the file. You can also try to call the function from the same divrat.m file in order to see if the problem is with workspace selection or the function.

By the way, why didn't you simply say

s = sqrt(diag(C));

Wouldn't it be the same?

User · Answer

As others have pointed out  this is very probably a problem with the path of the function file not being in Matlab s  path     One easy way to verify this is to open your function in the Editor and press the F5 key  This would make the Editor try to run the file  and in case the file is not in path  it will prompt you with a message box  Choose Add to Path in that  and you must be fine to go    One side note  at the end of the above process  Matlab command window will give an error saying arguments missing  obviously  we didn t provide any arguments when we tried to run from the editor  But from now on you can use the function from the command line giving the correct arguments

User · Answer

Also  name it divrat m  not divrat M   This shouldn t matter on most OSes  but who knows     You can also test whether matlab can find a function by using the which command  i e    which divrat

User · Answer

Also  name it divrat m  not divrat M   This shouldn t matter on most OSes  but who knows     You can also test whether matlab can find a function by using the which command  i e    which divrat

User · Answer

The function itself is valid matlab-code  The problem must be something else  Try calling the function from within the directory it is located or add that directory to your searchpath using addpath  pathname

User · Answer

Also  name it divrat m  not divrat M   This shouldn t matter on most OSes  but who knows     You can also test whether matlab can find a function by using the which command  i e    which divrat

User · Answer

The error code indicates the function definition cannot be found. Make sure you're calling the function from the same workspace as the divrat.m file is stored. And make sure divrat function is not a subfunction, it should be first function declaration in the file. You can also try to call the function from the same divrat.m file in order to see if the problem is with workspace selection or the function.

By the way, why didn't you simply say

s = sqrt(diag(C));

Wouldn't it be the same?

User · Answer

The error code indicates the function definition cannot be found. Make sure you're calling the function from the same workspace as the divrat.m file is stored. And make sure divrat function is not a subfunction, it should be first function declaration in the file. You can also try to call the function from the same divrat.m file in order to see if the problem is with workspace selection or the function.

By the way, why didn't you simply say

s = sqrt(diag(C));

Wouldn't it be the same?

User · Answer

The function itself is valid matlab-code  The problem must be something else  Try calling the function from within the directory it is located or add that directory to your searchpath using addpath  pathname

User · Answer

Also  name it divrat m  not divrat M   This shouldn t matter on most OSes  but who knows     You can also test whether matlab can find a function by using the which command  i e    which divrat

User · Answer

As others have pointed out  this is very probably a problem with the path of the function file not being in Matlab s  path     One easy way to verify this is to open your function in the Editor and press the F5 key  This would make the Editor try to run the file  and in case the file is not in path  it will prompt you with a message box  Choose Add to Path in that  and you must be fine to go    One side note  at the end of the above process  Matlab command window will give an error saying arguments missing  obviously  we didn t provide any arguments when we tried to run from the editor  But from now on you can use the function from the command line giving the correct arguments

User · Answer

You get this error when the function isn t on the MATLAB path or in pwd   First  make sure that you are able to find the function using    gt  gt  which divrat c  work divrat divrat m   If it returns    gt  gt  which divrat  divrat  not found    It is not on the MATLAB path or in PWD   Second  make sure that the directory that contains divrat is on the MATLAB path using the PATH command   It may be that a directory that you thought was on the path isn t actually on the path   Finally  make sure you aren t using a  private  directory   If divrat is in a directory named private  it will be accessible by functions in the parent directory  but not from the MATLAB command line    gt  gt  foo  ans         1   gt  gt  divrat 1 1      Undefined function or method  divrat  for input arguments of type  double     gt  gt  which -all divrat c  work divrat private divrat m    Private to divrat

User · Answer

You get this error when the function isn t on the MATLAB path or in pwd   First  make sure that you are able to find the function using    gt  gt  which divrat c  work divrat divrat m   If it returns    gt  gt  which divrat  divrat  not found    It is not on the MATLAB path or in PWD   Second  make sure that the directory that contains divrat is on the MATLAB path using the PATH command   It may be that a directory that you thought was on the path isn t actually on the path   Finally  make sure you aren t using a  private  directory   If divrat is in a directory named private  it will be accessible by functions in the parent directory  but not from the MATLAB command line    gt  gt  foo  ans         1   gt  gt  divrat 1 1      Undefined function or method  divrat  for input arguments of type  double     gt  gt  which -all divrat c  work divrat private divrat m    Private to divrat

User · Answer

The most common cause of this problem is that Matlab cannot find the file on it s search path   Basically  Matlab looks for files in    The current directory  pwd   Directly in a directory on the path  to see the path  type path at the command line   In a directory named   whatever the class of the first argument is  that is in any directory above  As someone else suggested  you can use the command which  but that is often unhelpful in this case - it tells you Matlab can t find the file  which you knew already   So the first thing to do is make sure the file is locatable on the path   Next thing to do is make sure that the file that matlab is finding  use which  requires the same type as the first argument you are actually passing   I el  If w is supposed to be different class  and there is a divrat function there  but w is actually empty      so matlab is looking for Double divrat  when there is only a   yourclass  divrat   This is just speculation on my part  but this often bites me

User · Answer

As others have pointed out  this is very probably a problem with the path of the function file not being in Matlab s  path     One easy way to verify this is to open your function in the Editor and press the F5 key  This would make the Editor try to run the file  and in case the file is not in path  it will prompt you with a message box  Choose Add to Path in that  and you must be fine to go    One side note  at the end of the above process  Matlab command window will give an error saying arguments missing  obviously  we didn t provide any arguments when we tried to run from the editor  But from now on you can use the function from the command line giving the correct arguments

User · Answer

As others have pointed out  this is very probably a problem with the path of the function file not being in Matlab s  path     One easy way to verify this is to open your function in the Editor and press the F5 key  This would make the Editor try to run the file  and in case the file is not in path  it will prompt you with a message box  Choose Add to Path in that  and you must be fine to go    One side note  at the end of the above process  Matlab command window will give an error saying arguments missing  obviously  we didn t provide any arguments when we tried to run from the editor  But from now on you can use the function from the command line giving the correct arguments

User · Answer

You get this error when the function isn t on the MATLAB path or in pwd   First  make sure that you are able to find the function using    gt  gt  which divrat c  work divrat divrat m   If it returns    gt  gt  which divrat  divrat  not found    It is not on the MATLAB path or in PWD   Second  make sure that the directory that contains divrat is on the MATLAB path using the PATH command   It may be that a directory that you thought was on the path isn t actually on the path   Finally  make sure you aren t using a  private  directory   If divrat is in a directory named private  it will be accessible by functions in the parent directory  but not from the MATLAB command line    gt  gt  foo  ans         1   gt  gt  divrat 1 1      Undefined function or method  divrat  for input arguments of type  double     gt  gt  which -all divrat c  work divrat private divrat m    Private to divrat

User · Answer

The most common cause of this problem is that Matlab cannot find the file on it s search path   Basically  Matlab looks for files in    The current directory  pwd   Directly in a directory on the path  to see the path  type path at the command line   In a directory named   whatever the class of the first argument is  that is in any directory above  As someone else suggested  you can use the command which  but that is often unhelpful in this case - it tells you Matlab can t find the file  which you knew already   So the first thing to do is make sure the file is locatable on the path   Next thing to do is make sure that the file that matlab is finding  use which  requires the same type as the first argument you are actually passing   I el  If w is supposed to be different class  and there is a divrat function there  but w is actually empty      so matlab is looking for Double divrat  when there is only a   yourclass  divrat   This is just speculation on my part  but this often bites me

User · Answer

I am pretty sure that the reason why this problem happened is because of the license of the toolbox  package  in which this function belongs in  Write which divrat and see what will be the result  If it returns path of the function and the comment Has no license available  then the problem is related to the license  That means  license of the package is not set correctly  Mostly it happens if the package  toolbox  of this function is added later  i e   after installation of the original matlab  Please check and solve the license issue  then it will work fine

User · Answer

You get this error when the function isn t on the MATLAB path or in pwd   First  make sure that you are able to find the function using    gt  gt  which divrat c  work divrat divrat m   If it returns    gt  gt  which divrat  divrat  not found    It is not on the MATLAB path or in PWD   Second  make sure that the directory that contains divrat is on the MATLAB path using the PATH command   It may be that a directory that you thought was on the path isn t actually on the path   Finally  make sure you aren t using a  private  directory   If divrat is in a directory named private  it will be accessible by functions in the parent directory  but not from the MATLAB command line    gt  gt  foo  ans         1   gt  gt  divrat 1 1      Undefined function or method  divrat  for input arguments of type  double     gt  gt  which -all divrat c  work divrat private divrat m    Private to divrat

User · Answer

The most common cause of this problem is that Matlab cannot find the file on it s search path   Basically  Matlab looks for files in    The current directory  pwd   Directly in a directory on the path  to see the path  type path at the command line   In a directory named   whatever the class of the first argument is  that is in any directory above  As someone else suggested  you can use the command which  but that is often unhelpful in this case - it tells you Matlab can t find the file  which you knew already   So the first thing to do is make sure the file is locatable on the path   Next thing to do is make sure that the file that matlab is finding  use which  requires the same type as the first argument you are actually passing   I el  If w is supposed to be different class  and there is a divrat function there  but w is actually empty      so matlab is looking for Double divrat  when there is only a   yourclass  divrat   This is just speculation on my part  but this often bites me

User · Answer

The most common cause of this problem is that Matlab cannot find the file on it s search path   Basically  Matlab looks for files in    The current directory  pwd   Directly in a directory on the path  to see the path  type path at the command line   In a directory named   whatever the class of the first argument is  that is in any directory above  As someone else suggested  you can use the command which  but that is often unhelpful in this case - it tells you Matlab can t find the file  which you knew already   So the first thing to do is make sure the file is locatable on the path   Next thing to do is make sure that the file that matlab is finding  use which  requires the same type as the first argument you are actually passing   I el  If w is supposed to be different class  and there is a divrat function there  but w is actually empty      so matlab is looking for Double divrat  when there is only a   yourclass  divrat   This is just speculation on my part  but this often bites me

User · Answer

The function itself is valid matlab-code  The problem must be something else  Try calling the function from within the directory it is located or add that directory to your searchpath using addpath  pathname

User · Answer

The function itself is valid matlab-code  The problem must be something else  Try calling the function from within the directory it is located or add that directory to your searchpath using addpath  pathname

User · Answer

The error code indicates the function definition cannot be found. Make sure you're calling the function from the same workspace as the divrat.m file is stored. And make sure divrat function is not a subfunction, it should be first function declaration in the file. You can also try to call the function from the same divrat.m file in order to see if the problem is with workspace selection or the function.

By the way, why didn't you simply say

s = sqrt(diag(C));

Wouldn't it be the same?

User · Answer

I am pretty sure that the reason why this problem happened is because of the license of the toolbox  package  in which this function belongs in  Write which divrat and see what will be the result  If it returns path of the function and the comment Has no license available  then the problem is related to the license  That means  license of the package is not set correctly  Mostly it happens if the package  toolbox  of this function is added later  i e   after installation of the original matlab  Please check and solve the license issue  then it will work fine

[function] MATLAB error: Undefined function or method X for input arguments of type 'double'

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