Sum of array items into another array

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np
np 2016-6-22
评论： Shameer Parmar 2016-6-24
I need to find the sum of items within each of the 360 arrays and then make another array with just the sums.
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np
np 2016-6-22
the speed1 speed2 are just the names of the arrays that are there
the values inside of them are numeric
Kirby Fears
Kirby Fears 2016-6-22
I understand that the values inside of speed1 and speed2 are numeric, but you wrote your example as "data.speed1". So are speed1 and speed2 contained in a workspace variable called data or not?

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采纳的回答

Kirby Fears
Kirby Fears 2016-6-22
Assuming data is a struct with fields speed1, speed2, etc.
sumArray = structfun(@sum,data);

更多回答（2 个）

Guillaume
Guillaume 2016-6-23
If your structure has fields other than the speed fields, you can loop over a hardcoded number of speed fields:
numspeed = 360;
speedsum = zeros(numspeed, 1);
for speedidx = 1:numspeed
speedsum(speedidx) = sum(data.(sprintf('speed%d', speedidx)));
end
Shameer Parmar
Shameer Parmar 2016-6-23
for i=1:length(fields(data))
s(i) = sum(eval(['data.speed',num2str(i)]));
end
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Guillaume
Guillaume 2016-6-23
1) Use fieldnames instead of fields. That won't solve the immediate problem as they both provide the same result, but fields is not supported whereas fieldnames is.
2) You get this error because your data has fields other than the 360 speed fields.
Shameer Parmar
Shameer Parmar 2016-6-24
Hello np..
I guess your length of fields(data) is more that 360, that why..
If yes, you can apply one more filter like..
for i=1:length(fields(data))
if i<=360
s(i) = sum(data.(['speed',num2str(i)]));
end
end

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