Undefined function or method 'cmap' for input arguments of type 'double'

2011 6 2
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[EDIT: 20110602 04:54 CDT - reformat, clarify - WDR]
i get this error when i run the following commands
for i=1:n
prompt = {'Enter image name i:','Enter colormap name i:'};
title = 'Image display - assignin example';
lines = 5;
%def = {'my_image','hsv'};
answer = inputdlg(prompt,title,lines);
assignin('base','imfile',answer{1});
assignin('base','cmap',answer{2});
end
k= ones(5,2);
for i=1:5
k(i,1)=str2double(cmap(i));
k(i,2)=str2double(imfile(i));
end
this works fine when i run them , but when i put these commands in my GUI program (the prompt window is a part of the GUI) then i get the above error
i have been trying it for over 10 days now without a clue towards the problem, pls pls help me
thanks

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Walter Roberson
Walter Roberson 2011-6-2

1 个投票

I don't know what answer you are expecting. cmap and infile would be character strings after the inputdlg, and indexing a character string gets you a single character; why would you want to interpret those characters as individual doubles when your default answer suggests you are expecting something like 'hsv' as the string?
In any case, your problem is that when you are in a function, cmap and imfile are going to refer to the cmap and imfile variables of the function, not to the cmap and imfile that you assigned in to the base workspace. Add this before the "for" loop:
cmap = evalin('base', 'cmap');
imfile = evalin('base','imfile');

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sumeet
sumeet 2011-6-2
THANK U WALTER
am new to MATLAB, and somehw have made a complex gui step by step just by experimenting with the software, so i lack the kind of simple common sense that u showed here
ur command works just fine and has solved my problem
thanks again
sumeet
sumeet 2011-6-3
there is another problem wid the above now, the matrix "k" is only taking the first digit of the number i input in the prompt. so i fi write "456" in the prompt box, then "k" only shows "4" for that element instead of showing " 456 "
sumeet
sumeet 2011-6-3
prompt = {'Enter image name:','Enter colormap name:'};
title = 'Image display - assignin example';
lines = 3;
%def = {'my_image','hsv'};
answer = inputdlg(prompt,title,lines);
assignin('base','imfile',answer{1});
assignin('base','cmap',answer{2});
cmap = evalin('base', 'cmap');
imfile = evalin('base','imfile');
% UIWAIT makes load_and_stress_calculation_CDF wait for user response (see UIRESUME)
% uiwait(handles.figure1);
k= ones(8,2)
for i=1:8
k(i,1)= str2num(cmap(i));
k(i,2)=str2double(imfile(i));
end
disp(k)

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