trailing string input must be double or native error

2014 2 27
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更新时间：2014 2 28
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hi, i have a text file that i have attached. i am plotting the 4th column.but the curve has some disturbances. to smoothen the curve i used the average:
for i=2:250 a(i)=sum(y(i-1),y,y(i+1)) z(i)=a(i)/3 end
i am getting the following error: error using sum trailing string input must be "double" or "native". what is the errror?
thanks in advance.
regards, shiksha

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shiksha
shiksha 2014-2-28
编辑：shiksha 2014-2-28
for i = 2:249 z(i) = sum(y(i-1:i+1))/3; end
how to display the answer z that i have obtained? i am just able to plot it.. and i want to plot the differential of z with time(5th column in text file), so i used: plot(diff(z)./diff(m(1:250,5)),'x') but i am getting an error : error using ==>rdivide matrix dimensions must agree..
the size of z is 1 249 the size of m(:,5) is 250 1 can u just tell me what is the error? please help..
regards, shiksha
shiksha
shiksha 2014-2-28
i got the answer. i just hd to transpose one input.

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Mischa Kim
Mischa Kim 2014-2-27
编辑：Mischa Kim 2014-2-27

0 个投票

Shiksha, I assume your text file has 250 rows? If that's the case in the statement
a(i)=sum(y(i-1),y,y(i+1))
you are accessing for i=250 the 251 st element, y(i+1), which results in the error. Also, the middle term does not access a particular element. Finally, unless you need matrix a, you could simply do
for i = 2:249
z(i) = sum(y(i-1:i+1))/3;
end

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shiksha
shiksha 2014-2-28
do u know how to apply low pass filter to smoothen the curve?
shiksha
shiksha 2014-2-28
how to display the answer z that i have obtained? i am just able to plot it.. and i want to plot the differential of z with time(5th column in text file), so i used: plot(diff(z)./diff(m(1:250,5)),'x') but i am getting an error : error using ==>rdivide matrix dimensions must agree..
can u just tell me what is the error? please help..
regards, shiksha

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