need help with warning
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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
2013-11-5
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 个评论
Stephen23
2015-12-22
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
2015-12-22
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;
更多回答(2 个)
Neesha
2013-11-5
1 个评论
Image Analyst
2013-11-5
Warnings do not stop code, only errors do. Please accept my answer if you have no more questions. Thanks.
Neil Caithness
2015-2-2
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 个评论
Image Analyst
2015-2-2
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
2015-12-22
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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