function itself does not work but each part on its own does

Question

Mario 2013-8-13

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Hi all. I just started programming in MatLab and faced the problem that the following function does not work but running each part on its own surprisingly does. Any help?

function w = we(index, maturity, tenorDate) %weights
          helper= cumprod(1./(1+rates(maturity:tenorDate-1)));
          nom   = helper(index-maturity+1);
          denom = cumsum(helper);
          w     = nom./denom(tenorDate-maturity);
end

whereby:

index = [6     7     8     9    10];
maturity= 6;
tenorDate=11;
rates = [0.0299 0.0366 0.0410 0.0444 0.0475 0.0497 0.0514 0.0522 0.0530 0.0540]'

Thanks a lot

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Matt J 2013-8-13

I don't get any error messages when I run the code.

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Answer 1

the cyclist 2013-8-13

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编辑：the cyclist 2013-8-13

You haven't included rates as an input to the function.

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Mario 2013-8-13

编辑：the cyclist 2013-8-13

在 MATLAB Online 中打开

Thank you for the answer. using your answer, why does the following function (which uses the function above) not work?

function F = F_Star(maturity, tenorDate, rates, weights)
         F = rates(maturity:tenorDate-1)*weights(maturity:tenorDate-1,   maturity, tenorDate, rates);
end

the cyclist 2013-8-13

编辑：the cyclist 2013-8-13

Guessing here, but you probably wanted to use " .* " rather than " * " for the multiplication.

In the future, it's best if you write the whole code that you are trying to execute, as well as the full error message you are getting.

Also, it is usually better to open a second question (possibly referring back to the first one), rather than bury a followup question in the comments. More people will see it that way.

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