Can anybody help me with the IFFT function in MATLAB?

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Andrew8611

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I have a vector with 10000 points that represents the magnitude of a frequency response of a FIR filter type 2, ¿How can I transform it to discrete form using ifft? because I tried to use it but the response is not what I expected, plz is urgent.
Do I need to do something special about the vector or about the function??
 

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