how can i implement transfer function in embedded matlab block?

2014 7 17
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更新时间：2017 6 24
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i need to generate a matlab code for a transfer function whose coefficient varies depending on frequency.In embedded matlab block i used the same way to generate transfer function code as in m-file. but it shows error.how can i implement transfer function in embedded matlab block?

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Reshna
Reshna 2014-7-19
The program is as follows;
function y = fcn(I,w) eml.extrinsic('tf')
s = tf('s'); a=0.4*w*s/(s^2+(2*w*s)+887364); b=0.4*w*s/(s^2+(2*w*s)+2464900); c=0.4*w*s/(s^2+(2*w*s)+4831204); d=0.4*w*s/(s^2+(2*w*s)+7986276);
y = I*(a+b+c+d); And the error messages are: 1) Expected either a logical, char, int, fi, single, or double. Found a MATLAB type. MATLAB types are returned from calls to the MATLAB interpreter and are not supported inside expressions. They may be used on the right-hand side of assignments and as arguments to MATLAB calls.
Function 'Embedded MATLAB Function' (#18.68.71), line 6, column 12: "s^2" 2)Undefined function or variable 'a'. The first assignment to a local variable determines its class.
Function 'Embedded MATLAB Function' (#18.196.197), line 11, column 8: "a" 3)Errors occurred during parsing of Embedded MATLAB function 'Embedded MATLAB Function'(#18) 4)Embedded MATLAB Interface Error: Errors occurred during parsing of Embedded MATLAB function 'Embedded MATLAB Function'(#18)

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回答（2 个）

Rick Rosson
Rick Rosson 2014-7-18

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doc coder.extrinsic

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Reshna
Reshna 2014-7-20
The program is as follows;
function y = fcn(I,w) eml.extrinsic('tf')
s = tf('s'); a=0.4*w*s/(s^2+(2*w*s)+887364); b=0.4*w*s/(s^2+(2*w*s)+2464900); c=0.4*w*s/(s^2+(2*w*s)+4831204); d=0.4*w*s/(s^2+(2*w*s)+7986276);
y = I*(a+b+c+d); And the error messages are: 1) Expected either a logical, char, int, fi, single, or double. Found a MATLAB type. MATLAB types are returned from calls to the MATLAB interpreter and are not supported inside expressions. They may be used on the right-hand side of assignments and as arguments to MATLAB calls.
Function 'Embedded MATLAB Function' (#18.68.71), line 6, column 12: "s^2" 2)Undefined function or variable 'a'. The first assignment to a local variable determines its class.
Function 'Embedded MATLAB Function' (#18.196.197), line 11, column 8: "a" 3)Errors occurred during parsing of Embedded MATLAB function 'Embedded MATLAB Function'(#18) 4)Embedded MATLAB Interface Error: Errors occurred during parsing of Embedded MATLAB function 'Embedded MATLAB Function'(#18)

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MOUMITA DEY
MOUMITA DEY 2017-6-24

0 个投票

how do i implement[(((1/T)*log(1+T*u))+1)/((10*(((1/T)*log(1+T*u))^3.2))+(185*(((1/T)*log(1+T*u))^2.5))+(288*(((1/T)*log(1+T*u))^0.7))+1)] as a transfer function in matlab where T is samplying time and u is gama

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提问:

Reshna
Reshna
2014-7-17

回答：

MOUMITA DEY
MOUMITA DEY
2017-6-24

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