In an assignment A(I) = B, the number of elements in B and I must be the same.

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Saleem Sarwar
Saleem Sarwar 2015-10-2
回答： Lessmann 2015-10-2
I need to compute runoff for 2 rainfall conditions
1. If rainfall > 5, then runoff = 1000/CN -10;
2. otherwise Runoff = (Rainfall -0.2 (1000/CN -10))^2 / (Rainfall + 0.80* (1000/CN -10)
My code is as follow
clear
>> Rainfall = randi(10,10,1);
>> CN = randi( 25,10,1);
>> idx = Rainfall > 5;
>> Runoff =size(Rainfall,1);
>> Runoff = zeros(Runoff,1);
>> Runoff(idx)= 1000/CN -10;
Runoff(~idx) = (Rainfall(~idx) - 0.2 * (1000/CN -10)^2)./Rainfall(~idx) + 0.8 *(1000/CN -10);
I am getting the following error when running the 1st condition
??? In an assignment A(I) = B, the number of elements in B and
I must be the same.
Could any body help to solve this issue? I am not very familiar with matlab and trying to write script for runoff calculation using Soil Moisture Condition. Thanks and regards, Saleem
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per isakson
per isakson 2015-10-2
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Lessmann
Lessmann 2015-10-2
Hi,
your problem is, that the dimensions of Rainfall and CN don't match. Use the the index idx or ~idx on CN. Also the operators in the last line need tweaking to work elementwise.
Here are the changed lines:
Runoff(idx)= 1000/CN(idx) -10;
Runoff(~idx) = (Rainfall(~idx) - 0.2 * (1000./CN(~idx) -10).^2)./Rainfall(~idx) + 0.8 *(1000./CN(~idx) -10);

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