I am new to MATLAB and have some code that I am running.I get an error that says the following in the command window:
error of non-existent field 'W'
Error in schedule2control (line 7)
ui = vertcat(schedule.control(c).W(:).val);
I understand that its telling me the variable W is non-existent.
If that is the case should that variable not show up under work space??
The variable its telling me is non existent (W) exists in my work space.
Any help/clarification would be great.
Related
I have a custom function I have made, which requires two input arguments. This is the opening line of the function, clearly showing it needs just two input arugments:
function [file,frame,vertices,edges,faces,faceOrders,edgeOrders] = FOLD_reader(filename,rundocfolder)
The FOLD_reader function is called within another function (FEAfromFOLDVaryingStiffness), using the following line of code:
[~,frame,vertices,~,faces,~,~] = FOLD_reader(filename,rundocfolder);
To which matlab claims:
Not enough input arguments.
Error in FEAfromFOLDVaryingStiffness (line 12)
[~,frame,vertices,~,faces,~,~] = FOLD_reader(filename,rundocfolder);"
However, if I copy and paste the offending line into the command window, it works perfectly. The filename and rundocfolder variables are definitely defined in FEAFromFoldVaryingStiffness which calls FOLD_reader, as they are among the input arguments of the FEAFromFold(etc) function itself.
Has anyone had any experience with this seemingly bizzarre error? To me it makes no sense at all.
If it's a help here are the lines up to the error point inside FEAfromFOLDVaryingStiffness:
function [] = FEAfromFOLDVaryingStiffness(filename,meshsize,displacement,m,n,stiffnessvary,rundocfolder)
%Comments ommitted for brevity
[~,frame,vertices,~,faces,~,~] = FOLD_reader(filename,rundocfolder);
I'm an idiot, I called the FEAfromFOLDVaryingStiffness with one too few arguments, I'd left out m or n or something and so the last input variable (rundocfolder) was undefined, which showed up as an error with fold_reader inside the FEAfromFOLDVaryingStiffness function, instead of where the error actually was: the top level script.
I have created this function :
function Calcul_Constantes ( xBin1 , xTin1 , xHin1 )
% computes global variables that change depending on the circumstances
global v rhoc K1v K2v xBin xTin xHin cBin cTin cHin;
xBin=xBin1;
xTin=xTin1;
xHin=xHin1;
rhoc = 0.02777*(2.106*xHin+78.12*xBin)*(6.935*xHin+23.15*xBin);
K1v=0.6*rhoc/175;
K2v=(2.70803*10^-4+7.5*10^-4*v*rhoc)/175;
cBin=0.02777*xBin;
cTin=0.02777*xTin;
cHin=0.02777*xHin;
end
and when I do test in my main script :
Calcul_Constantes(0,0,1);
xBin
xHin
the following error occures:
Error using Calcul_Constantes
Too many input arguments.
Error in Mercredi15_main (line 48)
Calcul_Constantes(0,0,1);
I'd be grateful for any help, I really can't see what does not work
Probably there is another Calcul_Constantes function somewhere else. You might have saved another version of Calcul_Constantes function somewhere.
In command line type :
which Calcul_Constantes
and check if the return directory and .m file is the which you are trying to use. Rename or delete the wrong function.
I am reading multiple netcdf files using the ncread function in matlab.
For a reason unknown to me, some files (described by FILEPATH in the following) are not properly read and ncread crashes, producing the error message:
Error using internal.matlab.imagesci.nc/openToRead (line 1259)
Could not open FILEPATH for reading.
Error in internal.matlab.imagesci.nc (line 121) this.openToRead();
Error in ncread (line 53)
ncObj = internal.matlab.imagesci.nc(ncFile);
Error in MY_FUNCTION (line 102)
Lon = nanmean(ncread(FILEPATH,'Lon'));
If you know of a method to test netcdf files without crashing, or if you understand what produces this error, any insight would be appreciated.
The standard way is to wrap the possibly-failing statement in a try/catch statement to intercept the thrown exception before interrupting the function execution, like this:
function [out1, out2, ...] = MY_FUNCTION(arg1, arg2, ...)
%//Initial code
try
Lon_data = ncread(FILEPATH,'Lon');
catch ME
warning('MY_FUNCTION:ncread', 'Could not load because <<%s>>',ME.message);
%//Do something to recover from error
%//Return from function if recover not possible
end;
Lon = nanmean(Lon_data);
%//Rest of the code
end
Please note that ... in the function signature above is not valid MATLAB syntax, but rather something that says "here are some inputs and outputs that I don't know how they are declared"; please substitute with your proper in/out declaration.
I am trying to set the first column of my dataset as the observation name. Each observation is a separate stock within dataset 'portfolio'.
I tried this command:
portfolio.Properties.ObsNames = portfolio.ticker
I got the error message
Error using dataset/subsasgnDot (line 31)
NEWNAMES must be a nonempty string or a cell array of nonempty strings.
Error in dataset/subsasgn (line 83)
a = subsasgnDot(a,s,b);
I looked at the code but didn't see where I went wrong.
I tried casting to a cell array but it didn't work. I used this code:
portfolio.Properties.ObsNames = dataset2cell(portfolio.ticker)
and got this error message
Undefined function 'dataset2cell' for input arguments of type 'cell'.
What should I try next?
I managed to cast it by doing the cast on a separate line.
So far from what I have read this error can be caused by confusing or redundant naming within the program but I don't think that is the issue here since everything is declared clearly. From what I can see in this my issue is coming from the declaration of piecewise that is then being run through integration below and therefor the program is attempting to access a array cell that doesn't exist. If this is the case I have so far been stumped at how to fix this issue. Any assistance with this problem would be greatly appreciated.
syms t k n
fct = #(t)evalin(symengine,['subs(piecewise([0 <= t and t < 2,',...
'sin((Pi*t^2)/4)],[t <= 2 and t < 3, 5*t-t^2-6], [t <=3 and t < 4, 0],',...
'[Otherwise, t-4]),t=',regexprep(mat2str(x),' ',','),')']);
evalin(symengine,'assume(k,Type::Integer)');
a = #(fct,t,k) int(fct*cos(k*pi*t/4)/4,t,-2,8);
b = #(fct,t,k) int(fct*sin(k*pi*t/4)/4,t,-2,8);
FourierSeries = #(fct,t,n) a(fct,t,0)/4 + ...
symsum(a(fct,t,k)*cos(k*pi*t/4) + b(fct,t,k)*sin(k*pi*t/4),k,1,n);
pretty(FourierSeries(t,25,1))
ezplot(FourierSeries(t,25,1),-2,8)
hold on
ezplot(fct,-2,8)
hold off
title('Partial sum with n=25')
The complete error text is as follows:
??? Attempt to reference field of non-structure array.
Error in ==> sym.int at 56
r = mupadmex('symobj::intdef',f.s,x.s,a.s,b.s);
Error in ==> #(fct,t,k)int(fct*cos(k*pi*t/4)/4,t,-2,8)
Error in ==>
#(fct,t,n)a(fct,t,0)/4+symsum(a(fct,t,k)*cos(k*pi*t/4)+b(fct,t,k)*sin(k*pi*t/4),k,1,n)
Error in ==> FourierProgram at 16 pretty(FourierSeries(t,25,1))
This was asked long ago, but I'll provide an answer since one was never given.
As your error indicates, the issue is with this line and how the anonymous function a is called:
a = #(fct,t,k) int(fct*cos(k*pi*t/4)/4,t,-2,8);
The sym/int function expects the second argument (the variable with which the integration is performed with respect to) to be a symbolic variable. However, you're calling FourierSeries(t,25,1), which passes the value 25 as the integration variable.
This bit of code should replicate the issue in your version of Matlab (back in 2011 when this was asked):
syms t k;
int(t*cos(k*pi*t/4)/4,25,-2,8)
However, in R2015a I now get a different (and a bit clearer) error message:
Cannot integrate with respect to ''. The integration variable must be a symbolic variable.