Syntax help: Linearly spaced vector and simple algebra

Question

0 个投票

How i write this in MATLAB

t=1790 to 2000

p(t)=197,273,000/(1+e-0.0313(t-1913.25)

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Answer 1

Laura Proctor 2011-6-13

0 个投票

t = 1790:2000;
p = 197273000./(1+exp(1)-.0313*(t-1913.25));

Walter Roberson 2011-6-13

That does not do what zizo asked: it will not create p(1790) to p(2000)

Answer 2

Walter Roberson 2011-6-13

1 个投票

Hints:

e is coded as exp(1) if you are talking about the base of the natural logarithms.
you need a multiplication symbol before your final '('
you need to have the same number of ')' as you have '('
commas are not permitted as thousand groupings in numbers
http://www.mathworks.com/help/techdoc/ref/for.html
are you really using e as a single constant, or does your original formula have e raised to some power? If it does have e raised to a power, see http://www.mathworks.com/help/techdoc/ref/exp.html