whole error as follows:
Attempt to execute SCRIPT feature as a function:
D:\MATLAB\feature.m
Error in images.internal.isFigureAvailable (line 9)
if feature('showFigureWindows')
Error in imshow (line 207)
if ~images.internal.isFigureAvailable()
Error in Feature_Detection (line 11)
imshow(I5); hold on;