plotting help needed (increasing resolution)

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dulanga 2019-4-21

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评论： Walter Roberson 2019-4-21

this is my code how would i increase the resolution of the graph?

N = 101; 
tmin = 0;
tmax = 3;
t = linspace(tmin,tmax,N);
x=2*cos(2*pi*t)+0.4*sin(16*pi*t);
y=4*sin(2*pi*t)+0.2*cos(16*pi*t)+t;
z=0.1*cos(16*pi*t)+t;
plot3(x,y,z)

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Answer 1

Walter Roberson 2019-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/457693-plotting-help-needed-increasing-resolution#answer_371585

Increase N, so that more t values are used.

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dulanga 2019-4-21

is there any other way to increase the resolution? it is told in the assignment that i should use N as 101

Walter Roberson 2019-4-21

在 MATLAB Online 中打开

What kind of "resolution" do you mean for this purpose?

If you print() the figure, then for most drivers you can use a '-r' option to specify a resolution. For example

print(gcf, 'MyOutput.png', '-dpng', '-r300');

in order to construct an output image with a resolution of 300 dots per inch (based upon the PaperSize property of the current figure.)

If you mean a plot that is more accurate, less approximate, then you could break your range into multiple sections using your mandatory N for each one. This might satisfy the rule but would certainly violate the spirit of the restriction, as it is directly equivalent to using a higher N.

Other than that.. well, you could use the symbolic toolbox so that there was less numeric approximation on terms like cos(2*pi*t) when t is an integer. You will find, though, that you would have to zoom into the plot quite a bit in order to see the difference, that for any finite display size that you are likely to have access to that it would turn out the same.

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