need help with warning
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Neesha
il 5 Nov 2013
Commentato: Image Analyst
il 22 Dic 2015
I am trying to do following which gives me warning and code does not execute any further. Please help resolve this
A = [91, 89, 90, 93, 95, 97]
A.switch1 = A <=91;
A.switch2 = A > 91,
I get following warning. How do i make it right? THanks
============================= Warning: Struct field assignment overwrites a value with class "double". See MATLAB R14SP2 Release Notes, Assigning Nonstructure Variables As Structures Displays Warning, for details.
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Image Analyst
il 5 Nov 2013
First you create a normal, typical numerical array of doubles. Then you create a structure with the same name, A. It's a structure because you added members/fields switch1 and switch2. I think it's just warning you that you're totally blowing away a variable with a completely new and different type of variable. Is that what you want to do? If it is, then just ignore the warning.
2 Commenti
Stephen23
il 22 Dic 2015
The OP is clearly confused, yet this answer does not really resolve the problem. Although the warning may be ignored on the second line, by the time the third line is run it will generate an error because the relational operator gt is not defined for structures. Ignoring the warning does not resolve this problem. A better solution would be to simply define a new variable for the structure, with a different name.
Image Analyst
il 22 Dic 2015
Some correction options:
% Possible fix #1.
dblA = [91, 89, 90, 93, 95, 97]
A.switch1 = dblA <= 91;
A.switch2 = dblA > 91,
% Possible fix #2.
A = [91, 89, 90, 93, 95, 97]
switch1 = A <= 91;
switch2 = A > 91;
Più risposte (2)
Neesha
il 5 Nov 2013
1 Commento
Image Analyst
il 5 Nov 2013
Warnings do not stop code, only errors do. Please accept my answer if you have no more questions. Thanks.
Neil Caithness
il 2 Feb 2015
From the latest release notes:
Assigning Structures to Nonstructures
Because of a bug, previous releases of MATLAB have allowed structure assignment to a nonempty nonstructure to overwrite the previous value. MATLAB continues to allow this in this release, but generates a warning message. In a future release, attempting this type of assignment will generate an error.
2 Commenti
Image Analyst
il 2 Feb 2015
Are you talking about the 2015a prerelease? Because this code generates no warning in R2014b:
% Create a non-empty variable "a" that is not a structure.
a=10;
% Create a structure, str.
str.field1 = 20;
str.field2 = 'abc';
% Now assign structure str to nonempty, nonstructure "a"
a = str; % No warning message.
Matthias Goldgruber
il 22 Dic 2015
You dont get a warning because you do something different!
Try the following:
a=10;
a.b=11;
Then you should get the same warning.
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