why do i receive error while evaluating UIcontrol Callback?

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NUR AINA BATRISYIA 2023-1-21

评论： Jan 2023-1-22

load ('db');

Ftrain=db(:,1:2);

Ctrain=db(:,3);

for(i=1:size(Ftrain,1))

dist(i,:)=sum(abs(Ftrain(i,:)-Ftest)):

end

try to retrieve results from db but it shows "Error while evaluating UIcontrol Callback"

Voss 2023-1-21

If "im" is defined in another function, you have to do something to make it accessible in this function, e.g., put it in the handles structure.

Jan 2023-1-22

This looks strange:

db=db.mat;
load db;

In the first line, db.mat extracts the field 'mat' of the struct called 'db'. The line

load db

is equivalent to the functional form:

load('db')

which adds '.mat' automatically. This might work by accident in your case. Most likely you mean:

db = 'db.mat';
load(db);

This looks similar, but has important differences.

After

Ftest=FeatureStatistical(im);

failed, because im is not a defined variable inside the current function, the line

db=db.mat;

will fail, because db is not a known variable also.

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R2022b

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