how to plot x= 0:0.01:10

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Bastian
Bastian 2023-12-10
回答： Image Analyst 2023-12-10
i attempted to do this but instead of giving me 0,1,2,3,4,5,6,7,8,9,10 on the x axis it gives me 0,5,15,20 idont understand why. Do i have to use linspace instead, on the newer version of matlab instead of what i used in the question?

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Dyuman Joshi
Dyuman Joshi 2023-12-10
Ran in:
I'm not sure what are you plotting against, but you will have to specify xticks manually -
x = 0:0.01:10;
y = sin(x);
%Default plot
figure
plot(x, y)
%Modified xticks
figure
plot(x,y)
xticks(0:10)

更多回答（1 个）

Image Analyst
Image Analyst 2023-12-10
Ran in:
Your badly-named "x" variable (almost everyone else would have called it y) goes from 0 to 10 in a thousand and one steps. When you plot just x, it will use x as the y value and the index (1 to 1001) as the x value.. Hence you will get a plot like this.
x = 0:0.01:10
x = 1×1001
0 0.0100 0.0200 0.0300 0.0400 0.0500 0.0600 0.0700 0.0800 0.0900 0.1000 0.1100 0.1200 0.1300 0.1400 0.1500 0.1600 0.1700 0.1800 0.1900 0.2000 0.2100 0.2200 0.2300 0.2400 0.2500 0.2600 0.2700 0.2800 0.2900
plot(x, 'b.-', LineWidth=2);
grid on;
xlabel('Index');
ylabel('Value of x');
title('x = 0:0.01:10')
Note that the x axis plots indexes 1 - 1001, and the y axis plots the value of your badly-named data.
If you have some other y and you want your x to actually be x, then you can't just plot(x), you must plot(x, y). Then to set up your x tick mark labels you can use xticks
xticks(0 : 10);

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