Why is this code looping?

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Amber
Amber 2012-7-10
%%Variables:
% aa,bb and x:counters
% bone: data of stress reading of a femer cantilevered with a different
% weight over a period of time
%
% averages1:averages of each basline
% averages2: x-coordinate where each jump occured
clc;clear;close all
time=-1:0.004:260.916;
load bone.mat
% plot(time,bone)
% grid
% hold on
bone2 = smooth(bone,750);
figure
plot(time,bone2,'g')
hold on
grid
while length(averages1)<=17 && aa>=length(bone2)
for x=1:1:70000; aa=x; bb=x+1;
difference=abs(bone2(aa)-bone2(bb));
if difference <= .009
flat(d)=[difference];
mean(difference)=averages1;
end
if difference >=.1
difference=abs(bone2(aa)-bone2(bb));
cc=length(bone2)-20000;
averages2(cc)=[find(bone2,max),find(bone2,min)]
end
end
I have written this code and it is supposed to find 17 averages and 17 jump points on the step function that gets plotted but it keeps looping after the 5th average. and I have no idea how to make the code find the jump points. Any help would be greatly appreciated.
  2 个评论
Sebastian Holmqvist
Sebastian Holmqvist 2012-7-10
Well, it's hard to see what you actually want to achieve with this code. But I notice that you never update averages1 inside of your loop. And since you don't have any break or return command this means that the while loop will just keep going.
Amber
Amber 2012-7-10
it's suppose to compare the y-coordinates one by one and then when there's a big difference between them record the x-coordinate at that point. when there is a small difference between the (i.e. a straight line) it is supposed to give me the mean of that section of the plot

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回答（1 个）

John Petersen
John Petersen 2012-7-10
编辑：John Petersen 2012-7-10
You've got variables that aren't initialized, aa,d, and indices must be positive integers. 'difference' does not seem like a proper index. You clearly need to add an index, such as,
k = k+1;
(also initialize it) and change the line
mean(difference)=averages1;
to
averages1(k) = mean(difference);
You might have other problems with your code, for example, aa never changes which is another test to stay in the loop. Can't see how you ever get in the loop without initializing that one.
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Amber
Amber 2012-7-10
Thank you though! :)
John Petersen
John Petersen 2012-7-11
that tells me that you're never satisfying the if(difference <=.009) test. Initialize averages1 and aa at least for good programming practice. Then single step through your program while observing how the variables are changing. This should give you some insight as to what's happening. Since I don't have your .mat files it's hard to debug it myself.

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