Text output keeps repeating

Hi! I'm getting a strange result -- my text overlay for my graph is repeating itself. It used to work fine and I didn't change any of that specific code, so I'm not sure why the change happened. In addition, while trying to debug, I wrote a simpler overlay and was able to see that the overlay repeats infinitely.

The code for the text overlay is below, as well as a picture of the problem.

Picture (no error):

Picture (current error):

Code:

        xlabel('Distance to the right/left of the center of the laser scanner in meters.'); 

        ylabel('Distance in front of the laser scanner in meters.');

        titleFrame = sprintf('ICP, overhead view. Scan # = %d', numberOfScans);

        title(titleFrame);

        output = sprintf('Angle: %f degrees. \nTotal Distance: %f m. \nRight Encoder Distance: %f m. \nLeft Encoder Distance: %f m.\nAverage Velocity: %f m/s. \nAcceleration: %f m/s^2.\n', robotAngle, robotMovement, rightEncoderTotal, leftEncoderTotal, robotVel, robotAcc);

        text(xText, yText, output, 'BackgroundColor',[1 1 1], 'EdgeColor', [0 0 0]);

Answer 1

[per isakson]

When debugging did you inspect the value of output? The code you show can hardly give multiple groups of lines. The values of robotAngle, robotMovement, etc. are they scalars?

>> sprintf( 'A: %f\nB: %f\n', [1;2], [3;4] )
ans =
A: 1.000000
B: 2.000000
A: 3.000000
B: 4.000000

Answer 2

[Walter Roberson]

text() will produce multiple copies of the output string if it is given non-scalar positions.