how to search values?

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Dimitrios 2014-9-26

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回答： Guillaume 2014-9-26

I was wondering if there is a way to find if any value of all my variables have a specific value e.g. NaN or Inf.Using OOP technics, workspace dont show all the variables,so i have to search manually all the variables in all classes to check it. Thanks in advance

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Adam 2014-9-26

编辑：Adam 2014-9-26

You'd need to give more information than that, including examples of the type of objects you have and exactly what you would want to extract from them.

Dimitrios 2014-9-26

Yea.Sorry i wasnt so precise. What i am trying to say is: with Cntrl+f user can search for a word in a .m file, Cntrl+Shift+F the same for multiple files. So i was wondering if there something in graphical interfece that can search values outputed from an allready run code.I dont want to extract something.I just want to check if any values of my variables are inf or NaN.I believe there is not but worth to ask. On the other hand, a function that search all my variables to check the desirable condition doesnt worth as i hae to write all the variables. Thanks anyway for your time.

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Answer 1

Andrew Reibold 2014-9-26

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编辑：Andrew Reibold 2014-9-26

在 MATLAB Online 中打开

To list all variables in your workspace

variables = who;

With this, you can loop through every variable, and check if it has a nan value

for i = 1:length(variables)
...
%check for inf and nan and whatever else you want
...
end

. FYI - If you didn't know, you can use eval('string') to check the values of the strings of variable names .

Here is an example of one way to check for infs and nans. I'm not sure how exactly you want to do it. I hope this helps!

MyArray = [ 0 1 4 3 nan 3 4 nan 3 inf ];
find(isnan(MyArray))
ans =
       5     8
find(isinf(MyArray))
ans=
      10

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Answer 2

Guillaume 2014-9-26

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在 MATLAB Online 中打开

To check if any of the values of cell arrays, structures or objects are NaN or Inf, you would have to write a function that inspect the cell array elements / structure fields / object properties, and call itself again if any of them is itself a cell array / structure / object.

Something like this (untested, there may be errors):

function [tf, names] = isnanobject(o)
  names = {};
  if isnumeric(o) || ischar(o)
    tf = any(isnan(o));
  elseif iscell(o)
    tf = any(cellfun(@isnan, o(:)));
  elseif isstruct(o)
    tf = false;
    for se = 1:numel(o) %in case o is an array of structure
      for fn = fieldnames(o)'
        [tff, namef] = isnanobject(o(se).(fn))
        if tff
          tf = true;
          names = [names, sprintf('(%d).%s%s', se, fn, namef)];
        end
      end
    end
  elseif isobject(o)
    tf = false;
    for so = 1:numel(o) %in case o is an array of objects
      for pn = properties(o)'
        [tff, namep] = isnanobject(o(se).(pn))
        if tff
          tf = true;
          names = [names, sprintf('(%d).%s%s', se, fn, namep)];
        end
      end
    end
  else %neither numeric, char, cell, struct, or object
    error('forgot something');
  end
end