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i want to get vectors of same length in my result.

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sud
sud 2018-5-16
编辑： Jan 2018-5-16
Hello, need help in the following problem. BC is 1x99 and a(i), b(i) and c(i) are 1x30. and i want to plot BC vs a(i), but i am getting following error: In an assignment A(:) = B, the number of elements in A and B must be the same. any help much appreciated
data = load(FF);
mass = data(:,1); %extracting all rows of column 1
deq = data(:,16); %extracting all rows of column 16
BC = (15:10:995);
for i = 1:length(BC)-1;
index = deq>=BC(i)-5 & deq<BC(i)+5;
masstemp = mass(index);
a(i) = min(masstemp);
b(i) = median(masstemp);
c(i) = max(masstemp);
end
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Stephen23
Stephen23 2018-5-16
编辑：Stephen23 2018-5-16
"i dont know why the format of my program changes when i write it here!!!!!"
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回答（1 个）

Jan
Jan 2018-5-16
编辑：Jan 2018-5-16
This line is a problem:
N = size(BC,99);
This replies the length of 99th dimension of the array BC. I'm sure, that you do not have a 99 dimensional array. But Matlab accepts this command, because there is the implicit assumption, that all trailing dimensions are be 1.
X = rand(2,3);
size(X, 3)
>> 1
In you code N becomes 1 and the loop:
for i = 1:N-1
is not entered at all, because it runs from 1 to 0. In consequence the variables a,b,c are not created. I guess, that the shown code is a script and that there are some values of former runs in the workspace.
  1. Convert your code to a function to keep the workspace clean. Simply start the text with "function YourFcn".
  2. Fix the size(BC, 99) command. I cannot imagine what is wanted here.
  3. These commands look weird:
a(i,:) = min(masstemp,:);
b(i,:) = median(masstemp,:);
c(i,:) = max(masstemp,:)
This would be meaningful, if min is a matrix, then masstemp is an index and : means, that the complete rows are selected. The code in the original question looks better:
a(i) = min(masstemp);
b(i) = median(masstemp);
c(i) = max(masstemp);
Here the minimum, median and maximum values of the vector masstemp are determined.
Finally, the error message is
Error using scatter (line 62) X and Y must be vectors of the same length.
Your N is a scalar, and a,b,c have N-1 elements. This cannot work. What do you want to draw with these scatter commands?

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