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how can i make this loop?

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Mamad Mamadi
Mamad Mamadi 2020-1-19
关闭： MATLAB Answer Bot 2021-8-20
hi friends im new in matlab could you please help me in this problem.
I have an equations A ; A=x*a-b
x=[1 2 5 8 10];
i want to put x values into equation A one by one to solve it, which i mean x1=1, to solve A1 and x2=2 to solve A2 and so on.
after that i want to use the results that i found in this equation B= (A1...An / c).
thanks

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回答（1 个）

Star Strider
Star Strider 2020-1-19
No loop needed.
If you want to calculate ‘A’ with ‘a’ and ‘b’ already defined numerically as scalars, or if ‘b’ is a vector the same size as ‘x’, just do this:
A = x*a-b
If ‘a’ is a vector with the same dimensions as ‘x’, use element-wise multiplication:
A = x.*a+b
You might need to use bsxfun to do the vector multiplications if you have R2016a or earlier.
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Mamad Mamadi
Mamad Mamadi 2020-1-21
sad to say i use the old version R2013a :(
Star Strider
Star Strider 2020-1-21
The bsxfun function was introduced in R2007a, so you can use it to do the multiplications. I believe the additions always used explicit expansion. If they do not, use bsxfun for those as well:
A = bsxfun(@minus, bsxfun(@times, x, a), b)
That should work.
The loops are all still there, however they are hidden in the bsxfun calls.

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