How can I subtract every element in an array (including the first element) from the first element of the same array

Hi guys,

I am calculating the Bodys CoM and I need to find the Jump Height from it. To do so, I need to subtract every element in the array of the Bodys CoM from the first element of the array (which is basically like the starting point). Any ideas how I can do this? Any help would be appreciated.

Answer 1

[Voss]

v = 3:4:15 % an array

v = 1x4

3 7 11 15

v-v(1) % subtracting the first element from each element

ans = 1x4

0 4 8 12

v(1)-v % subtracting each element from the first element

ans = 1x4

0 -4 -8 -12

[Aman Kumar]

Thank you,

JumpHeight = Body_CoM - Body_CoM(1);

biggestJump = max(JumpHeight);

disp(['Maximum Jump height 1',num2str(biggestJump),' meters'])

this is my code for calculating the maximum jump height from the Bodys CoM. In the workspace section of matlab, the value for the function biggestJump = 0.6080, but when I display this on the monitor using the disp function the value that is shown is 10.608, do you know any reason this could be happening and how to avert this.

[Voss]

Because of the extra '1' in the disp call.

Body_CoM = [13 13.608 13.3];
JumpHeight = Body_CoM - Body_CoM(1);
biggestJump = max(JumpHeight)

biggestJump = 0.6080

% extra '1':
disp(['Maximum Jump height 1',num2str(biggestJump),' meters'])

Maximum Jump height 10.608 meters

% no extra '1':
disp(['Maximum Jump height ',num2str(biggestJump),' meters'])

Maximum Jump height 0.608 meters

[Aman Kumar]

Thank you so much for all the help, a terrible oversight from my behalf :/.

Thank you again.