# Multiply each element of a matrix by different element from another matrix

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Brittany Burns on 27 Jul 2021
Commented: Stephen on 28 Jul 2021
I am trying to fix the for loop, so I can find Fsp for each angle, but xi is not the same dimension as Fsp. Xi is based on an angle theta, 0-360. Fsp is a function of Xi, Fspo, and Giss.
massg=10^-5:10; %mass [g]
mass=massg/1000; %mass [kg]
Ra_leo=2000; Ra_geo=35786; % altitude[km]
riss=450+R; %ISS altitude [km]
rgps=20200+R;%GPS altitude [km]
rgeo=35786+R;%GEO altitude [km]
theta=0:360; %angle [degrees]
xi=cosd(theta); %shielding factor
%Graviational focusing factor
Giss=1+Ra_leo/riss;
Ggps=1+Ra_leo/rgps;
Ggeo=1+Ra_geo/rgeo;
% Calculate Forces
F1=(2.2E3.*mass.^.306+15).^-4.38;
F2=1.3E-19.*(mass+10.*mass.^11.*mass.^2+10.*mass.^27.*mass.^4).^-0.36;
F3=1.3E-16.*(mass+10^6.*mass.^2).^-0.85;
Fspo=3.15576E7.*(F1+F2+F3);
for i=1:length(Fspo)
for j=1:length(theta)
Fsp(j)=Fspo.*xi.*Giss;
end
end
Stephen on 28 Jul 2021
"It's stated in the hw problem as using that"
They are extremely odd values to use. One should definitely not assume that academics do not make mistakes.
massg = 10.^(-5:1)
massg = 1×7
0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 10.0000

David Hill on 27 Jul 2021
massg=10^-5:10; %mass [g]
mass=massg/1000; %mass [kg]
Ra_leo=2000; Ra_geo=35786; % altitude[km]
riss=450+R; %ISS altitude [km]
rgps=20200+R;%GPS altitude [km]
rgeo=35786+R;%GEO altitude [km]
theta=0:360; %angle [degrees]
xi=cosd(theta); %shielding factor
%Graviational focusing factor
Giss=1+Ra_leo/riss;
Ggps=1+Ra_leo/rgps;
Ggeo=1+Ra_geo/rgeo;
% Calculate Forces
F1=(2.2E3.*mass.^.306+15).^-4.38;
F2=1.3E-19.*(mass+10.*mass.^11.*mass.^2+10.*mass.^27.*mass.^4).^-0.36;
F3=1.3E-16.*(mass+10^6.*mass.^2).^-0.85;
Fspo=3.15576E7.*(F1+F2+F3);
%try meshgrid
[Fspo,xi]=meshgird(Fspo,xi);
Fsp=Fspo.*xi*Giss;%matrix with all the calculations
##### 2 CommentsShowHide 1 older comment
Jan on 28 Jul 2021
"Does not work" is not useful to explain, what the problem is. Please post a copy of the ecomplete error message.