How to use if statement inside a for loop?

2022 5 5
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更新时间：2022 5 6
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I'm currently trying to print out something if the difference between the plots is bigger than 100.
for i = 2:10
plot(x(:,25+i)
dif(:,i) = x(:,25+i) - x(:,25+(i-1)); %error here
if dif >200
fprintf( ) %print out the x value where it was triggered
else
fprintf('nothing')
end
I'm having trouble saving each occurance that it happens.

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Walter Roberson
Walter Roberson 2022-5-5

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for i = 2:10
plot(x(:,25+i)) ; hold on
dif(:,i) = x(: ,25+i) - x(:,25+(i-1));
mask = dif(:, i) > 200
if any(mask)
fprintf('col %d: %s\n', 25+i, mat2str(x(mask, 25+i))); %print out the x value where it was triggered
else
fprintf('col %d: nothing\n');
end
end

4 个评论
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Emily
Emily 2022-5-6
Thanks for the response, unfortunately I'm still getting an error here,
dif(:,i) = x(: ,25+i) - x(:,25+(i-1));
Walter Roberson
Walter Roberson 2022-5-6
you have not told us what the error message is, or what size of x is, or whether dif exists before this point in the code.
Emily
Emily 2022-5-6
Size of x is about 2000x2000 value from a struct, and there is a difference between the some of the figures but depends on the input file number.
I was able get it working by getting rid of the (:,i) and only using dif=. But now not sure how to display the X-axis value on where this is happening as the code prints out the Y-axis value of the looped graphs when mask is detected.
Walter Roberson
Walter Roberson 2022-5-6
The code I showed cannot print out the y axis values. The code I showed uses mat2str(x(mask, 25+i)) which displays x values, not y values.
The vectorized form of the code would look more like
i = 2:10;
plot(x(25+i))
dif = x(:,25+i) - x(:,25+i-1);
mask = dif > 200;
for c = 1:size(dif,2)
submask = mask(:,c);
if any(submask)
fprintf('col %d: %s\n', 25+c+1, mat2str(x(submask, 25+c+1))); %print out the x value where it was triggered
else
fprintf('col %d: nothing\n', 25+c+1);
end
end

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