Putting for loop values into a matrix/array for plotting

I am trying to find the optimum length of a bridge with regards to cost. I'm trying to put the values from each loop into an array/matrix so I can then find the correspoding road and bridge lengths for the lowest cost on each cost ratio, however the answers from each loop are "seperate" from all other loops and I need them in one array. Does anyone know if this is possible, and if so how I would be able to do this I'm struggling to figure out how it can be done. Thanks.

Ly = 8.7 %total length ravine

Lx = 1.1 %width of ravine

Cs = 1e6 %cost of road per km

for r = 1.1:0.5:5 %varying ratio between road cost per km and bridge cost per km

Ls = 0.1:0.1:8.6; %varying length of road

Lb = sqrt((Ly-Ls).^2 + Lx.^2); %equation to find length of bridge from the length of road

C =((r*Cs)*(Lb))+(Cs*Ls); %equation for total cost of bridge and road

min(C) %minimum value of C for each ratio loop

end

Answer 1

[Kevin Shi]

Hi Daniel,

It seems you are trying to collect the result of each iteration in to one array.

If this is the case, you can initialize a double array before the for loop, then append the result of each iteration to the end of the array, below is an example(I just assume that you want collect minium cost, you can change is to whatever you want later);

Ly = 8.7; %total length ravine
Lx = 1.1; %width of ravine
Cs = 1e6; %cost of road per km
result = [];

for r = 1.1:0.5:5  %varying ratio between road cost per km and bridge cost per km 
    Ls = 0.1:0.1:8.6; %varying length of road    
    Lb = sqrt((Ly-Ls).^2 + Lx.^2); %equation to find length of bridge from the length of road
    C =((r*Cs)*(Lb))+(Cs*Ls); %equation for total cost of bridge and road
    result(end + 1) = min(C) %minimum value of C for each ratio loop
end   

Hope this is helpful.

[Daniel Galaczi]

That did exactly what I wanted thank you so much for the quality and the speed of the reply.