Undefined function or variable in MATLAB

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Joshua
Joshua 2013-7-19
I have this function saved as element.m Whenever I call on it I say element(Hydrogen) I am trying to get it to display the name, symbol, atomic number, category, ... But it keeps saying Undefined function or variable 'Hydrogen' I don't understand why its doing this.
function [Name, Symbol, Atomic_Number, Category, Proton, Neutron, Electron]=element(e)
%Inputs:
%e - 'Hydrogen' ;
%Outputs:
%Name
%Symbol
%Atomic_Number
%Category
%Proton
%Neutron
%Electron
e=[Hydrogen Helium]
if e=='Hydrogen'
Name='Hydrogen';
Symbol='H';
Atomic_Number='1';
Category='Nonmetal';
Proton='1';
Neutron='';
Electron='1';
elseif e==Helium
Name='Helium'
Symbol='H'
Atomic_Number='1'
Category='Noble Gas'
Proton='4'
Neutron='2'
Electron='4'
end
end

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采纳的回答

per isakson
per isakson 2013-7-19
What is e=[Hydrogen Helium] intended to do?
  8 个评论
显示 6更早的评论
per isakson
per isakson 2013-7-19
You have to make a call like
[Name,Symbol,Atomic_Number,Category,Proton,Neutron,Electron]=element('Hydrogen')

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更多回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-7-19
The variable Hydrogene is not defined in your code, how Matlab will recognize it?
  2 个评论
Joshua
Joshua 2013-7-19
编辑：Joshua 2013-7-19
I am kind of new to MATLAB, how exactly would i define it if I wanted it to give me the Name, Category, Symbol ...

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Jason Schneider
Jason Schneider 2013-7-19
Remove
e = [Hydrogen Helium]
Use
strcmp as previously suggested.
Make sure when you call the function it is of the form:
[a b c d e f g] = element('Hydrogen')
You need to define where the rest of the output arguments will be assigned since they are internal variables to the function.
It seems this was also mentioned but the input argument needs to be a string or else Matlab will look for a variable that doesn't exist.

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