Why my graph only contain 4 lines instead of 6 lines

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Dan 2023-6-6

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评论： Dan 2023-6-6

I defined a function which is calculate_pi, and using 6 different method to approxiamt the value of pi. The compute answer is correct, but when I use the answer to calculate the error between the value of pi in matlab, and plot the error in graph, it only shows 4 lines instead of 6 lines. I don't know why, can somebody help me? I appreciate that!

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VBBV 2023-6-6

Can you share the code for function calculate_pi instead of snapshot ?

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Answer 1

Nathan Hardenberg 2023-6-6

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https://ww2.mathworks.cn/matlabcentral/answers/1978934-why-my-graph-only-contain-4-lines-instead-of-6-lines#answer_1251129

编辑：Nathan Hardenberg 2023-6-6

Check if your err-array for "left-hand" and "right-hand" has values in it. If thy are NaN, it does not plot a line, but no error is thrown

-- EDIT -- (after calculate_pi() Code)

Three of your methods result in the same graph ("left_end", "right_end" and "trapezoidal"). Thats why you are only able to see four graphs. I plotted with different linestyles to make it more obvious.