Plotting a for loop

Question

Salvie Morales 2019-9-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/480654-plotting-a-for-loop

评论： Steven Lord 2019-9-16

Hi! I'm super new to MatLab so I am probably just making a dumb mistake but each time I try to plot my for loop I get a graph but no data is represented on it. Can someone set me straight? My entry looks like:

for i = 0:100;
    C = i;
    F = (C*1.8)+32;
    plot (C,F)
    xlabel('Celsius')
    ylabel('Fahrenheit')
end
C
F

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Answer 1

Matt J 2019-9-16

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/480654-plotting-a-for-loop#answer_392137

编辑：Matt J 2019-9-16

C=nan(1,101); F=C; %preallocate
for i = 0:100;
    C(i+1) = i;
    F(i+1) = (i*1.8)+32;
end
    plot (C,F)
    xlabel('Celsius')
    ylabel('Fahrenheit')

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Matt J 2019-9-16

Or, with no looping,

C=0:100;
F=C*1.8+32;
plot(C,F)

Steven Lord 2019-9-16

Matt J has given you two solutions. If you are required to plot inside the loop, you can create an animatedline before the loop and calling addpoints on the animatedline inside the loop. See the animatedline documentation page for examples.

As for why your original approach wasn't working, it was plotting a line each iteration through the loop. Each of those lines consisted of exactly one point; they weren't automatically connected to the previous lines created by previous loop iterations.

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