Why am I having so many errors?
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Shawn Simon
le 23 Oct 2015
Commenté : Walter Roberson
le 24 Oct 2015
The purpose of the code is to take the inputs and calculate the weight of something on a different planet. Here is the code:
name = input('What is the name of the exoplanet? ', 's');
massplanet = input( sprintf('What is the estimated mass of %s(kg)? ', name), 's');
radius = input( sprintf('What is the estimated radius of %s(km)? ', name), 's');
massspecimen = input('What is the mass of the specimen (kg)? ');
%calculating acceleration due to gravity of other planet using:
%G * mass / radius^2
%G is a constant
Accel_of_G_exo = ((6.67e-11) * massplanet) / radius^2 ;
%calculating weight of specimen using acceleration due to gravity of other
%planet and mass of specimen
Weight_exo = Accel_of_G_exo * massspecimen;
%trying to print the name of the planet as well as the variable Weight_exo
fprintf('On %s, it would weigh about %f Newtons.',name, Weight_exo);
However, when I run the code, I am getting an error on the line where I try to define the variable 'Accel_of_G_exo'. I am assuming the variables 'massplanet' and 'radius' are stored as string types, therefore they can not be incorporated in an equation. Also, on the last line, I tried to print a statement that included the variables 'name' and 'Weight_exo', however, I do not think that I can use %s with fprintf. Thank you so much for the help. I am new to MATLAB and am still learning the program.
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Walter Roberson
le 24 Oct 2015
You need to str2double() the strings that hold the masses. Or just skip the 's' option of input() to read the values as numeric.
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Stalin Samuel
le 24 Oct 2015
Accel_of_G_exo = ((6.67e-11) * massplanet) / radius.^2 ;
Weight_exo = Accel_of_G_exo * massspecimen ;
fprintf('On %s, it would weigh about %d Newtons.',name, Weight_exo);
2 commentaires
Walter Roberson
le 24 Oct 2015
That would happen because your radius is a string, which in MATLAB is a vector of characters.
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