I want to plot a simple graph with specific x,y coordinates. I can plot when the y values are integers. But i need to plot values like 9/4. this is my error code Attempted to access y(2.25); index must be a positive integer or logical.

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JJ
JJ 2017-1-25
评论： Niels 2017-1-25
i want to plot the points (0,2) (1,9/4) (2,38/17) (3,161/72) (4,682/305)

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Niels
Niels 2017-1-25
plot([0 1 2 3 4],[2 9/4 38/17 161/72 682/305])
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JJ
JJ 2017-1-25
Thanks, i cant believe i was trying to make it so complicated. Do you know if you can extend the decimal value on the graph? I have changed to format long, on the screen the decimals haven changed but the graph is still rounding them, i wanted to show the values converging to sqrt(5)
Niels
Niels 2017-1-25
you can change the YAxes Tick but it seems like you are not familiar with structur arrays nor properties of anything, so it will be hard for you. if you want to have more decimals on your y axes you have to acces the axes-properties .YTick:
>> h=plot(x,y,'.--');
>> h.Parent.YTick=[linspace(2,2.2,3),linspace(2.21,2.25,6)];

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