input variable stored in matrice

Hi there I wrote a program that could calculate the distance an object falls due to gravity. I prompted the user to enter a g amount and the program would calculate the the distance. Now i would like to store the specific g of the different planets in a matrice. The user would enter the name of the planet and matlab will then from there calculate the distance fallen. could anybody assist me or guide me to the right path. Much appreciated.

Answer 1

[Aurele Turnes]

You could also use a structure named g to store the value of g for each planet instead of a matrix. For example, you create your structure as follows:

g.Earth = …
g.Mars = …
g.Uranus = …

Then, when the user inputs a planet, you can use dynamic field naming to access the appropriate g as follows:

user_planet = 'Earth';
user_g = g.(user_planet);

The following article gives a short introduction on dynamic field naming in structures:

<http://blogs.mathworks.com/loren/2005/12/13/use-dynamic-field-references/>

Answer 2

[Michael Haderlein]

e.g.

planets={'Earth','Moon','Mars'};
g=[9.81 1.62 3.71];
user_planet=inputdlg('Planet name: ');
planet_ID=strmatch(user_planet,planets);
if isempty(planet_ID)
msgbox('Planet not found');
else
user_g=g(planet_ID);
%further calculations
end

[oselu]

Thank You very much

Answer 3

[oselu]

Thank you guys I will try all these methods. really appreciate it