Where is the problem???

Hi,

UserData.matrix(3,3) is type of cell, and d is also type of cell. I got this error:

??? Error using ==> mupadmex Error in MuPAD command: Can't evaluate to boolean [bool];

during evaluation of 'subproc'

Error in ==> sym.sym>sym.eq at 755 X = mupadmex('symobj::eq',A.s,B.s,9);

Error in ==> Simulator>vzaj_indukc_Callback at 5432 find(sym(UserData.matrix(3,3))==sym(d))

Why? Here is the code:

find(sym(UserData.matrix(3,3))==sym(d))

[Walter Roberson]

At the command prompt give the command

dbstop if error

and run the program. When it stops, use the command

dbup

as many times as you need to in order to get back to vzaj_indukc_Callback. Once you are there, please show us what UserData.matrix(3,3) and d contain.

I suspect the error has to do with the cell nature. I am not sure what sym() of a cell array would mean.

[john]

Hi, for example UserData.matrix(3,3) is "L1,ww,3||L2,M2,2||L3,f44,2.4" and d is "L1".

So for example find('L1,ww,3||L2,M2,2||L3,f44,2.4'=='L1')

I thing, "sym" is problem....if I use "char"

find(char(UserData.matrix{3,3})==char(d))

then is error ??? Error using ==> eq Matrix dimensions must agree.

[john]

with "char" and based on dbstop if error and dbup I got:

   % evaluate the callback now
      varargin{1} = gui_State.gui_Callback;
      if nargout
          [varargout{1:nargout}] = feval(varargin{:});
      else       
here*****       feval(varargin{:});
      end

[john]

I used

strfind(char(UserData.matrix{3,3}),char(d))

[Walter Roberson]

Is UserData.matrix(3,3) a cell that contains the symbolic expression

L1,ww,3||L2,M2,2||L3,f44,2.4

? I am not sure how you would construct such an expression in MuPAD; would it be via

(L1,ww,3)||(L2,M2,2)||(L3,f44,2.4)

thus constructing sequences joined by ? Or is it a vector entry, sort of a Vector((L1,ww,3), (L2,M2,2), (L3,f44,2.4)) with sequences as each of the vector entries? Or is it a 3 x 3 matrix,

L1 ww 3
L2 M2 2
L3 f44 2.4

??

[john]

UserData.matrix is not always 3 x 3 matrix, but in column 3 is information. This information means: with witch inductors has inductor a mutual inductance. "L1,ww,3" means than inductor has mutual inductance with inductor L1, ww is mutual inductance and 3 is numerical value of mutual inductance.

To add new info I use:

UserData.matrix{pom3+3,3}=sscanf(strcat(char(UserData.matrix{pom3+3,3}),',,',char(pom2),',',get(handles.mut_ind_symb,'string'),',',get(handles.mut_ind_val, 'String')), '%s');

I hope it is answer :-)

Answer 1

[Image Analyst]

Don't cast to anything! Just use strfind():

string1 = 'L1,ww,3||L2,M2,2||L3,f44,2.4'
d = 'L1'

location = strfind(string1, d)
if ~isempty(location)
  message = sprintf('%s was found\nin %s\nat index %d.',...
    d, string1, location);
else
  message = sprintf('%s was NOT found in %s.',...
    d, string1);
end
uiwait(msgbox(message));