Plotting complicated function with asymptotes

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Ben Phelps 2021-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/758839-plotting-complicated-function-with-asymptotes

评论： Ben Phelps 2021-3-1

采纳的回答： Image Analyst

Hi,

I am struggling to plot this equation in Matlab

I have tried using plot, fplot and ezplot but none seem to be able to handle it. Would anyone be able to help me with this?

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Image Analyst 2021-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/758839-plotting-complicated-function-with-asymptotes#answer_635734

Did you try

y = linspace(7, 12, 1000);
signal = exp(y .* cot(y)) .* sin(y);
plot(y, signal, 'b-', 'LineWidth', 2);
grid on;
xlabel('y');
ylabel('Signal');

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Image Analyst 2021-3-1

编辑：Image Analyst 2021-3-1

y = linspace(0, 16, 2000);
signal = exp(y .* cot(y)) .* sin(y);
% Get rid of vertical "asymptotes" by setting anything outside our viewing range to nan.
nanIndexes = signal > 100;
signal(nanIndexes) = nan;
% Plot signal in solid black line.
plot(y, signal, 'k-', 'LineWidth', 2);
grid on;
xlabel('N', 'FontSize', fontSize);
ylabel('y', 'FontSize', fontSize);
ylim([-10, 40]);
title('signal = exp(y .* cot(y)) .* sin(y)', 'FontSize', fontSize);
% Plot dashed line from (0, 0) to (7.5, 40);
hold on;
plot([0, 7.5], [0, 40], 'k--', 'LineWidth', 2);
% Plot dashed line from (0, 0) to (16, 15);
plot([0, 16], [0, 15], 'k--', 'LineWidth', 2);
% Make a black line along the x axis
yline(0, 'LineWidth', 2);