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from Eular angles GUI by Maxim Vedenyov
Eular angles visualization and connection with axis-angle rotation.

stp1(h,st,clb,fig)
function stp1(h,st,clb,fig)


sr=str2num(get(h,'string'));

% fud=get(fig,'UserData');
% st=fud{2}*sign(st);

if length(sr)==0
    nan_error;
else
    sr=sr+st;
end

set(h,'string',num2str(sr));

eval(clb);

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