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Need help with this Math exercise please
Oct 9, 2016 at 9:56am
Greetings everyone, I am new to the site. I have this problem I need to program in C++:
Q:Calculate the coordinate of the point (2,3,1) after a rotation through 90deg about the x-axis.
Here is my attempt at it but I am not 100% certain this is correct, hence why I'm posting this thread:
I multiplied the 3x3 Matrix (1 0 0, 0 0 -1, 0 1 0) by the coordinates (2, 3, 1) and I obtained the following resultant matrix: [2, -1, 3]
Is my work correct? If not, please point out my mistake and give me a hint if possible, thank you.
Q:Calculate the coordinate of the point (2,3,1) after a rotation through 90deg about the x-axis.
Here is my attempt at it but I am not 100% certain this is correct, hence why I'm posting this thread:
I multiplied the 3x3 Matrix (1 0 0, 0 0 -1, 0 1 0) by the coordinates (2, 3, 1) and I obtained the following resultant matrix: [2, -1, 3]
Is my work correct? If not, please point out my mistake and give me a hint if possible, thank you.
Last edited on Oct 9, 2016 at 9:56am
Oct 9, 2016 at 11:02am
Looks correct.
Now you just need to write a C++ program to this.
Tip: Instead of writing an algorithm to do matrix multiplication, just get the expression for each point.
Now you just need to write a C++ program to this.
Tip: Instead of writing an algorithm to do matrix multiplication, just get the expression for each point.
Oct 9, 2016 at 11:56am
In the future, you should post in the beginners section of this forum.
Oct 10, 2016 at 5:25amclosed account (48T7M4Gy)
Looks to be right.
See also https://en.wikipedia.org/wiki/Rotation_matrix
1 0 0 2 2 0 0 -1 3 = -1 0 1 0 1 3 |
See also https://en.wikipedia.org/wiki/Rotation_matrix
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