Question regarding variable name

[markraz]

Hi, in the below matrix, can someone please tell me what the 'c' represents? and what is the sub symbol next to it?
thanks in adavnced

source: https://en.wikipedia.org/wiki/Rotation_matrix

 

[Dr.Peterson]

Hi, in the below matrix, can someone please tell me what the 'c' represents? and what is the sub symbol next to it?
thanks in adavnced
View attachment 25221
source: https://en.wikipedia.org/wiki/Rotation_matrix

When you see an unfamiliar symbol, always look just before or after its first appearance for the definition!

Here is your snip, with one more line of context:



Now, can you tell me what \(c_\theta\) means?

They are just abbreviating, to reduce the size of this monster. I often write just c and s for the same purpose in the middle of a long calculation.

 

[markraz]

When you see an unfamiliar symbol, always look just before or after its first appearance for the definition!

Here is your snip, with one more line of context:

View attachment 25224

Now, can you tell me what \(c_\theta\) means?

They are just abbreviating, to reduce the size of this monster. I often write just c and s for the same purpose in the middle of a long calculation.

Theta?

 

[Dr.Peterson]

Theta?

Yes, \(c_\theta\), with subscript theta, is the cosine of the angle theta by which something is rotated. And \(s_\theta = \sin(\theta)\).

 

[markraz]

Yes, \(c_\theta\), with subscript theta, is the cosine of the angle theta by which something is rotated. And \(s_\theta = \sin(\theta)\).

ooooh dunce cap lol... I'm slow.....Thanks for your help appreciate it

 

[Subhotosh Khan]

ooooh dunce cap lol... I'm slow.....Thanks for your help appreciate it

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