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Help me avoid this error: Empty matrix: 0-by-1

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Pham
Pham 2013-8-5
评论： Bachtiar Muhammad Lubis 2019-5-25
I have a program like this:
clc
a=[0 0; 150 0.5; 300 0.35; 450 0.253; 600 0.22; 750 0.276; 900 0.183; 1050 0.228; 1200 0.17; 1350 0.207; 1500 0.2; 1650 0.19; 1800 0.187; 1950 0.21; 2100 0.176; 2250 0.197; 2400 0.17]
b=[900 900 750 2100 750 150 150 150 300]'
for i=1:5
c=find(a(:,1)==b(i));
f=a(c,:);
d(i)=prod(f);
end
e=sum(d)
My main program for many vectors b with components of a. I want to find e, but few result of c are Empty matrix: 0-by-1
Help me. Thanks.
  1 个评论
Pham
Pham 2013-8-5
编辑：Pham 2013-8-5
Thank you for helping me. But I do not understand why in my main program, with 3 value "150 150 150" in vector b, then the vector c is "0.5 Empty matrix: 0-by-7 Empty matrix: 0-by-8", without "0.5 0.5 0.5" ??

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采纳的回答

Iain
Iain 2013-8-5
编辑：Iain 2013-8-5
Change : d(i) = prod(f); to
if isempty(f)
d(i) = NaN;
else
d(i) = prod(f);
end
and e = sum(d) to:
e = nansum(d);
If NaN isn't convenient, change it for something that is.

更多回答（1 个）

Jan
Jan 2013-8-5
d = nan(1, 5);
for i=1:5
c = (a(:, 1) == b(i));
if any(c)
d(i) = prod(a(c, :));
end
end

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