How does Matlab divide two row vectors by each other to get a scalar?

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Osama Tabbakh 2019-10-16

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评论： Star Strider 2020-10-8

采纳的回答： Star Strider

Let's consider, A is a vector like shown:

A = [20 30 40];

and B is also a vector:

B = [5 10 20];

when you want to execute this operation:

C = B/A;

then you will get a scalar: 0.4137

if you want to check this answer by doing this:

C.*A

It should be got B again but you will get this vector instead:

ans =

8.2759 12.4138 16.5517

Could somebody explain what's going on?

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Stephen23 2019-10-16

"It should be got B again"

Can you show us the system of equations for which this statement is true?

Osama Tabbakh 2019-10-16

I was just an example for understanding how calculate matlab this scalar 0.4137 and why it is scalar.

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采纳的回答

Star Strider 2019-10-16

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#How does Matlab divide two row vectors by each other to get a scalar.png

To expand slightly on that, ‘C’ is the least-squares estimate of the slope of

with the y-intercept forced through the origin:

figure
plot(A,B,'p',  A,C*A,'-r',  [0 A(1)],C*[0 A(1)],':k')
axis([0  45    0  25])

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Timo Tommila 2020-10-8

编辑：Timo Tommila 2020-10-8

awesome, thank you I was wondering the same thing.

Star Strider 2020-10-8

My pleasure!

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