How can I run the calculation of one equation through a range of variables in one loop

1 view (last 30 days)
Hi
I am inexperienced with MATLAB and new to this forum.
I and am trying to calculate weight transfer at varying inclines at varying amount of acceleration and get a range of values out which i can then calculate the amount of tyre deflection and plot (Wf, Ax), (Wf, S_T), and (Dt, Wf).
I am ok with plotting.
I hope you can help
Thanks in advance
Stu
i = 1;
for S_T = 0:3:60
TS_T =(deg2rad(S_T));%incline in Radians
TGDs = sin(TS_T); %Sine of incline
TC_T =(deg2rad(S_T));%incline in Radians
TGDc = cos(TC_T); %Cosine of incline
for Ax = 0:0.25:5
Wf(i)=(((W*cWB*TGDc)-(W*hCoG*TGDs)-((W/g)*Ax*hCoG))/WB)/9.81;
end
if Wf>=0
Wfo = Wf;
Dt = (0.5*Wfo)/(0.00028*P*d+3.45);
end
end
i=i+1;

Answers (2)

Walter Roberson
Walter Roberson on 19 Oct 2021
S_T = 0:3:60; %row vector
TGDs = sind(TS_T); %Sine of incline
TGDc = cosd(TC_T); %Cosine of incline
Ax = (0:0.25:5).'; %column vector
Wf = (((W .* cWB .* TGDc) - (W .* hCoG .* TGDs) - ((W./g) .* Ax .* hCoG))./WB)./9.81;
Wfo = nan(size(Wf));
Dt = nan(size(Wf));
mask = Wf > 0;
Wfo(mask) = Wf(mask);
Dt(mask) = (0.5*Wfo(mask)) ./ (0.00028 .* P .* d + 3.45);
This will give you results that are length(ST) columns and length(Ax) rows.
Your existing code only copies to Wfo and Dt for cases where Wf are positive -- leaving it undefined what should happen if Wf <= 0. I duplicate that behaviour as best practical by writing NaN into Wfo and Dt and only putting in other values for the locations where Wf > 0
  1 Comment
Stuart Usher
Stuart Usher on 20 Oct 2021
Hi Walter
Thanks for your reply.
This still does not produce what i need, which is the output from the equation calculated using the S-T 0:1:60 (61 calculations) while at Ax 0:0.25:5 (21 calculations) totaling 1281 calcutation of Wf
Thanks for your help
Stuart

Sign in to comment.


KSSV
KSSV on 19 Oct 2021
You can proceed something like below. No need to use loops.
i = 1;
S_T = 0:3:60 ;
TS_T =(deg2rad(S_T));%incline in Radians
TGDs = sin(TS_T); %Sine of incline
TC_T =(deg2rad(S_T));%incline in Radians
TGDc = cos(TC_T); %Cosine of incline
Ax = 0:0.25:5;
Wf=(((W*cWB*TGDc)-(W*hCoG*TGDs)-((W/g)*Ax*hCoG))/WB)/9.81;
Wfo = Wf(Wf>=0) ;
Dt = (0.5*Wfo)/(0.00028*P*d+3.45);

Categories

Find more on Programming Utilities in Help Center and File Exchange

Products


Release

R2021b

Community Treasure Hunt

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

Start Hunting!