I am trying to accomplish this same task using the find() command but I'm not sure how.

Question

James Raj 2019-4-23

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评论： Star Strider 2019-4-23

clear all
n = 1
for k = 0:.1:6
    x(n) = k
    if (2 <= x(n))&&(x(n) <= 4)
        y(n) = 2*k
    else
        y(n) = -5*k
    end
    n=n+1
end
plot(x,y)

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Answer 1

Star Strider 2019-4-23

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Here is a version that uses a logical vector in place of the find function:

x = 0:0.1:6;
y = -5*x;
lv = (2 <= x) & (x <= 4);                       % Logical Vector Of ‘x’ Elements Satisfying Conditions
y(lv) = 2*x(lv ~= 0);
figure
plot(x,y)

A version using the find function would be:

x = 0:0.1:6;
y = -5*x;
idx = find((2 <= x) & (x <= 4));                % Index Vector Of ‘x’ Elements Satisfying Conditions
y(idx) = 2*x(idx);
figure
plot(x,y)

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James Raj 2019-4-23

Thanks!

Star Strider 2019-4-23

As always, my pleasure!

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Answer 2

Walter Roberson 2019-4-23

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在 MATLAB Online 中打开

Hint:

t = 1:1.5:20;
output = zeros(size(t));
ind = find(t >= 3 & t <= 9);
output(ind) = sin(t(ind));
ind = setdiff(1:numel(t), ind);
output(ind) = -cos(t(ind));