Undefined function 's' for input arguments of type 'double'

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Maciej Satora
Maciej Satora 2017-9-2
评论： Madhusudan Kulkarni 2018-2-25
Hello, I am writing class and my methods. And I've got trouble calling the function r. When I write:
  • obj = BasicClass;
  • obj.Value = 1;
for example. And then I want to call the function by:
  • answer = x(obj)
I got warning: Undefined function 's' for input arguments of type 'double'. Any ideas how could I repair it to achieve this reference in the function x? A reference that calls two other functions in the third one?
classdef BasicClass
properties
Value
end
methods
function [Result] = r (myobj)
Result = recurseComputeR(myobj.Value);
end
function [eindruck] = s (myobj)
eindruck = ComputeS(myobj.Value);
end
function [deltaf] = x (myobj)
deltaf = ComputeDeltaF(myobj.Value);
end
end
end
function deltaf = ComputeDeltaF(myobj)
deltaf = 0.0001 * (1000000000*s(myobj)+500000000*r(myobj));
end
function eindruck = ComputeS(myobjValue)
eindruck = myobjValue*0.000001;
end
function Result = recurseComputeR(myobjValue)
if myobjValue > 0
Result = recurseComputeR(myobjValue-1)*1000+2/1000000000000;
else
Result = 2/1000000000000;
end
end
Thank You very much in advance :)

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回答（3 个）

Henry Giddens
Henry Giddens 2017-9-2
Your function computeDeltaF expects the object as the input, not the property value
Change the following line:
function [deltaf] = x (myobj)
deltaf = ComputeDeltaF(myobj);
end
Steven Lord
Steven Lord 2017-9-2
A method of a class must accept an instance of the class as one of its inputs, unless it's a Static method. A class function, defined after the classdef block but in the same file, can accept an instance of the class but more commonly accepts just some data.
If a function needs to call a method on an instance of the class, the function probably should be a public method (if you need/want it to be accessible by code outside the class definition), a private method (if it doesn't need to be accessible by code outside the class definition), or a class function that accepts an instance of the object.
So let's look at the functions associated with your class.
function [Result] = r (myobj)
Result = recurseComputeR(myobj.Value);
end
Accepts an instance of the class, intended to be called by users of your class. Currently defined as a method, which I feel is correct.
function [eindruck] = s (myobj)
eindruck = ComputeS(myobj.Value);
end
Ditto what I said for your r method.
function [deltaf] = x (myobj)
deltaf = ComputeDeltaF(myobj.Value);
end
Ditto what I said for r and s.
function deltaf = ComputeDeltaF(myobj)
deltaf = 0.0001 * (1000000000*s(myobj)+500000000*r(myobj));
end
Currently defined as a class function. This calls methods on the class itself (s and r). I would make this either a private method or a class function into which you pass the object, not just one of the object's properties. Search the documentation for "class attributes" to learn how to make this into a private method if that's the approach you choose.
function eindruck = ComputeS(myobjValue)
eindruck = myobjValue*0.000001;
end
Currently defined as a class function. This only needs the value of one of the object's properties, so it seems appropriate as a class function.
function Result = recurseComputeR(myobjValue)
if myobjValue > 0
Result = recurseComputeR(myobjValue-1)*1000+2/1000000000000;
else
Result = 2/1000000000000;
end
end
Currently defined as a class function. Doesn't need to use the object, just one of its property values that is passed into it by its caller. Appropriate as a class function.
swati paliwal
swati paliwal 2018-2-14
vrxmf=zeros(rowmx,6); rowmx=1000; nrow=1; %...............printing in to file............. for n1=1:nrow-1; fid1=fopen('C:\Users\hp\Documents\MATLAB\ss1.dat'); fopen(fid1); fprintf(fid1,'%10.6f\t%10.6f\t%10.6f\t%7.4e\t%10.6f\t%10.6f\t\n',...... vrxmf1(n1,1),vrxmf1(n1,2), vrxmf1(n1,3), vrxmf1(n1,4), vrxmf1(n1,5),vrxmf1(n1,6));
Undefined function 'vrxmf1' for input arguments of type 'double'. Error in newton>fit_fun (line 435) fprintf(fid1,'%10.6f\t%10.6f\t%10.6f\t%7.4e\t%10.6f\t%10.6f\t\n',...... vrxmf1(n1,1),vrxmf1(n1,2), vrxmf1(n1,3), vrxmf1(n1,4), vrxmf1(n1,5),vrxmf1(n1,6)); How can i eliminate this error
  1 个评论
Madhusudan Kulkarni
Madhusudan Kulkarni 2018-2-25
create your own thread for same problem. Many people may see and answer. Type program properly. No end statement in given program.

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