Error bars are all the same size?

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Anna
Anna 2014-4-1
编辑： Azzi Abdelmalek 2014-4-1
Here is my code:
x = [8,9,10,12,14,16,18,20,25,30,40,50];
y = [10.7,8.9,7.3,5.5,4.3,3.4,2.7,2.3,1.6,1.1,0.7,0.5];
x = 1./(x.^2);
[c,s] = polyfit(x,y,1);
[f,delta] = polyval(c,x,s);
plot(x,y)
errorbar(x,f,delta)
Why does the plot result in the error bars all being the same size because experimentally they shouldn't be. What am I doing wrong?
  2 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2014-4-1
What experiment are you talking about?
Anna
Anna 2014-4-1
The experiment measured distance and radiation level (Stefan-Boltzmann law).

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Azzi Abdelmalek
Azzi Abdelmalek 2014-4-1
编辑：Azzi Abdelmalek 2014-4-1
If you look at delta, you can see that the values are not equal
0.2935 0.2719 0.2608 0.2526 0.2515 0.2522 0.2535 0.2547 0.2571 0.2587 0.2605 0.2614
The values are slightly different, visually, you can't see the difference in the figure

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