How do I get every combo of a two vectors to put into an equation?

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Katharine Woodruff 2019-7-23

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评论： Katharine Woodruff 2019-7-25

Hello,

I want to multiple every combo of two unequal vectors. The first is Roll = 0:5:180 , (0, 5, 10, 15...180); the second is Pitch = 0:5:90 (0, 5, 10...90)

I need to then put every combo of those in this equation:

for (every combo of Roll and Pitch values) <<what type of for loop would I put here ?

if Roll > 40 && Pitch > 40

((180/Roll) + (90/Pitch))/2

if Roll > 40

180/Roll

if Pitch > 40

90/Roll

else

0

end

I am hoping to graph all the combos after they go through this equation. e.g the combos could be roll = 5 , pitch =10; roll =15, pitch = 80; roll = 60, pitch = 80 and so on...

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Answer 1

Guillaume 2019-7-23

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It's really not clear what your if statements are meant to do since you wrote some calculations that are not assigned to anything. In any case, the efficient way to do whatever you want to do is not to use if or loops:

Roll = 0:5:180;
Pitch = 0:5:90;
[Roll, Pitch] = ndgrid(Roll, Pitch);  %cartesian product of the 2 sets
%taking a guess at what you want to do. Your conditions don't make sense
Result = zeros(size(Roll));
Result = 180 ./ Roll + 90 ./ Pitch / 2;  %generic case
Result(Roll < 40) = 180 ./ Roll(Roll < 40);  %other condition
Result(Pitch < 40) = 90 ./ Roll(Pitch < 40);  %other condition
surf(Roll, Pitch, Result);