清空筛选条件
清空筛选条件

Why am I having so many errors?

2 次查看（过去 30 天）
Shawn Simon
Shawn Simon 2015-10-23
评论： Walter Roberson 2015-10-24
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.

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2015-10-24
You need to str2double() the strings that hold the masses. Or just skip the 's' option of input() to read the values as numeric.

更多回答（1 个）

Stalin Samuel
Stalin Samuel 2015-10-24
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 个评论
Shawn Simon
Shawn Simon 2015-10-24
When I ran this, it gave me an error on the Accel_of_G_exo line saying there was an error using '/'.
Walter Roberson
Walter Roberson 2015-10-24
That would happen because your radius is a string, which in MATLAB is a vector of characters.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Gravitation, Cosmology & Astrophysics 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by