Dynamics Problem using two moving object

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BlkHoleSun
BlkHoleSun 2017-10-27
评论： BlkHoleSun 2017-10-30
I've been having problems solving this equation in MATLAB. Solving on paper is more intuitive to me and I'm struggling in making the language jump. So far, here is my code:
pA = [0 14]; %position of ship A at start
pB = [-25 0]; %position of ship B at start
vA = [0 -7]; %velocity of ship A at start
vB = [16 0]; %velocity of ship B at start
for t=1:4;
dA=(pA+vA*t) %position of A based on time
dB=(pB+vB*t) %position of B based on time
end
I can't seems to figure out how to get the positions of each of the ships in relation to each other. Once I do that, I was attempting to use the zeros function to solve for the 8 mile visibility. couldn't get it to work. Thanks for your help!

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Birdman
Birdman 2017-10-27
编辑：Birdman 2017-10-27
You can find position of A with repsect to B by the following:
pAwrtB=dA-dB;%position of A with repsect to B
vice versa:
pBwrtA=dB-dA;%position of B with repsect to A
Because imagine every time we spot our position on the x-y coordinate axis, we actually reference to the origin and to this
dOurPosition - [0 0]
But in this situation, relative positions are found just as above. Change the for loop like this:
for t=1:4
dA=pA+vA*t;
dB=pB+vB*t;
pBwrtA=dB-dA;%position of B with repsect to A
pAwrtB=dA-dB;%position of A with repsect to B
end
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BlkHoleSun
BlkHoleSun 2017-10-30
Thanks for the help. I've learned a lot about graphing this problem!

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