How to write this equation?

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MAHMOUD ALZIOUD
MAHMOUD ALZIOUD 2019-11-26
评论： MAHMOUD ALZIOUD 2019-11-26
Dear All, I have this equation in excel, what is the best way to write in matlab?
Y = 1.13+13/(1+EXP(7.57-15.5*LOG(x+0.0001)))
I tried this in matlab, but it did not give the same results for all values of x:
Y = 1.13+(13./(1+exp(7.57-15.5.*log(x+0.0001))));
x is a vector column of 200 values.
  2 个评论
Image Analyst
Image Analyst 2019-11-26
What values did x cover? Which of those gave a different value? Can you attach x in a .mat file or .xlsx file?
http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer
MAHMOUD ALZIOUD
MAHMOUD ALZIOUD 2019-11-26
Yes now this is the file, please see the columns of the results.
thanks

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Rik
Rik 2019-11-26
There is a difference between log and log10. What you have done in Excel is actually calculate the log10, because you omitted the base as an input. The log function in Matlab computes the natural logarithm. If you want to have the same effect, either put EXP(1) as the base in Excel, or use this in Matlab:
Y = 1.13+(13./(1+exp(7.57-15.5.*log10(x+0.0001))));

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