using find-command to find max or min value
显示 更早的评论
Please I need your help to estimate the value of min or max of abs(Y) and its corresponding (X) for attached curve (X versus X ) using (find)-command. In addition want plot a line of corresponding (X) and (Y).
Thanks in advance for all.
Best Regards;
采纳的回答
x = 0:13;
y = randi(25,1,14)/100;
[ymax,idx] = max(y)
figure
plot(x, y)
hold on
plot([1 1]*x(idx), [min(ylim) ymax], '-r')
plot([0 x(idx)], [1 1]*ymax, '-r')
hold off
grid
Experiment with your data.
.
1 个评论
As always, my pleasure!
Using find is straghtforward —
x = 0:13;
y = randi(25,1,14)/100;
idx = find(y == max(y))
figure
plot(x, y)
hold on
plot([1 1]*x(idx), [min(ylim) y(idx)], '-r')
plot([0 x(idx)], [1 1]*y(idx), '-r')
hold off
grid
That requires essentially the same code.
.
更多回答（1 个）
I prefer using the find function in combination to find max and min locations. The reason being if the max occurs at more than one location, max only gives you the location of the first one. I've asked them for many, many years to return the index(es) of all max in the vactor.
y = [1 3 2 3 0] % Max at index 2 and 4
[maxValue, indexes] = max(y) % Only gives you the one at index 2 not at 4.
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