MATLAB: How to use message box

message box

I have some code that works out the y value of the first point on my graph where x>6. This is the 'failure' point.
figure
plot(x,y), hold all
failure=find(x>6,1);
I want to the display whatever this y_value is in a message box on the figure. I don't understand how I can get it to display the number that 'failure=find(x>6,1);' creates.
If I did msgbox('failure') it would just display the word 'failure' in the box, not the number. Any ideas?

Best Answer

msgbox(sprintf('Failure is at %d',failure))
or maybe you would rather put it on the plot directly:
annotation('textbox',[.7,.1,.1,.1],'String',sprintf('Failure is at %d',failure))
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