I made a logarithmic graph, and I want to add a continuous linear line that follows the equation y = x with x values from 1 to N.

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Joshua 2023-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/1908515-i-made-a-logarithmic-graph-and-i-want-to-add-a-continuous-linear-line-that-follows-the-equation-y

评论： Voss 2023-2-8

Below is my code. My issue is that my continuous line is not showing on my graph. Since the log and linear plots are of diffrant magnitudes I used plotyy. so the left should be for log and the right for linear.

n = 100;

factorial = log10(cumprod(1:n));

semilogy(factorial);

title('Logarithmic Growth')

hold on

x = 1:n;

plotyy(n,factorial,n,x)

hold off

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Answer 1

Voss 2023-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/1908515-i-made-a-logarithmic-graph-and-i-want-to-add-a-continuous-linear-line-that-follows-the-equation-y#answer_1166175

在 MATLAB Online 中打开

Perhaps you mean:

plotyy(1:n,factorial,1:n,x)

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Joshua 2023-2-8

Thank you I think that looks right!

Voss 2023-2-8

在 MATLAB Online 中打开

You're welcome!

The problem with

plotyy(n,factorial,n,x)

was that your x-coordinate is a scalar (n), so plotyy plots one line per y-coordinate (factorial or x), producing numerous lines, each with only one point, and you can't see a line that consists of only one point unless it has a data marker.

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