calculate the function in vector.

Question

JaeSung Choi 2017-6-12

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评论： JaeSung Choi 2017-6-13

I want to calculate my 'poly' function for domain of linspace(0,1,100) so I tried ---------------------------------

%make poly function
function [output] = poly(input)
output= ([input^0 input^1 input^2 input^3 input^4 input^5]*transpose([1.0000 1.0001 0.4991 0.1703 0.0349 0.0139]) )
end
----------------------------------
x = linsapce(0,1,100)
poly(x)
----------------------------------

but it doesn't work. I found that for sin(x) it does. I want to know what's different between to func. and how to solve the problem.

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KSSV 2017-6-12

What is the input you used? You have to take care of element by element operations.

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Answer 1

Andrei Bobrov 2017-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/344319-calculate-the-function-in-vector#answer_270545

编辑：Andrei Bobrov 2017-6-13

在 MATLAB Online 中打开

function [output] = AsPolyvalForJaeSung(input)
    output = bsxfun(@power,input(:),0:5)*[1.0000;1.0001;0.4991;0.1703;0.0349;0.0139];
end

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JaeSung Choi 2017-6-13

Oh my god, you exactly catched what i wanted. Thank you very much!!

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Answer 2

KSSV 2017-6-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/344319-calculate-the-function-in-vector#answer_270398

在 MATLAB Online 中打开

For

input = linspace(0,1,100) ;

In the line

output= ([input.^0 input.^1 input.^2 input.^3 input.^4 input.^5]*transpose([1.0000 1.0001 0.4991 0.1703 0.0349 0.0139]) )

The size of term in square braces would be 1X600 where as the term transpose i.e second term got only 6X1 terms. How you expect them to multiply? You need to rethink on your code.

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JaeSung Choi 2017-6-12

That's what I'm in problem. I want to derive y = [poly(0) poly(0.01) ...... poly(1)] (i.e. calculate for each domain) As for 'sin' function If we take x = linspace(0,1,100) y = sin(x) then y = [sin(0) sin(0.01) sin(0.02)..... sin(1)] I want to do same for my own function

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