disp gives wrong format

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Kelly McGuire
Kelly McGuire on 17 Oct 2019
Answered: Image Analyst on 17 Oct 2019
I was making a program to calculate the vertical displacement and then display a matrix of the time and displacement outputs. The output should be in seconds and meters, but disp() is changing the decimal place when the values are printed. Why is this happening? Here is the code:
% Program that calculates vertical motion under gravity - ignoring air
% friction
% Initialize Constants
g = 9.81; % gravity acceleration - m/s^2
u = 60; % initial velocity - m/s
t = 0 : 0.01 : 12.3; % time array from 0 to 12.3 seconds in 0.01 second intervals
s = u*t - g/2*t.^2; % vertical displacement equation - meters
title('Vertical Motion Under Gravity');
xlabel('Time (seconds)');
ylabel('Vertical Displacement (meters)');

Answers (2)

Wiley Mosley
Wiley Mosley on 17 Oct 2019
I was not able to recreate the issue that you described. One thing to note is depending on your settings it could be outputing a scientific notation form with a call of 1.0e-01 at the start that may be confusing.
Kelly McGuire
Kelly McGuire on 17 Oct 2019
I have the 2016b academic version. I put format short before disp(), and it fixed the format.

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Image Analyst
Image Analyst on 17 Oct 2019
Try fprintf() instead of disp():
fprintf('%6.2f, %9.6f\n', [t; s]);
With fprintf() you can get exactly the appearance you want.

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