MATLAB: Plot not displaying x axis correctly

functionsplots

Hello, I am making a function that creates a y value for a range of x values, say -7 to 7. I enter in x = (-7:7), put it through the function, and get values for Y. but then, when I plot it, the X axis is labeled according to column rather than value, as in the axis displays 0 through 15 rather than -7 to 7. how do I fix this?

Best Answer

Show us code to prove it, but, from the symptom described you wrote something like:

x=-7:7;
y=yourfunction(x);
plot(y)

which would display what you described (and have done precisely what you told MATLAB to do). With no x passed to it, plot doesn't know anything at all about the fact you defined x somewhere else; all it can do is use what it was given.

plot(x,y)

is the correct syntax.

HINT: Read the documentation before crying wolf! It'll be faster most of the time than waiting for somebody here to see and answer. :)

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MATLAB: Plotting 2D Sensor data with the same value on X-axis

I am not certain what you want.

Try this:

C = { 'A'  'B'  'C'};
V = [-78 -77 -91
    -77  -77  -90
    -75  -77  -91
    -78  -77  -92
    -77  -77  -91
    -76  -77  -91
    -78  -77  -90
    -78  -77  -91
    -78  -77  -90
    -76  -77  -88
    -79  -77  -89
    -77  -77  -92
    -77  -77  -92
    -77  -77  -90
    -78  -77  -91
    -78  -77  -92
    -77  -77  -96
    -77  -77  -94
    -78  -77  -96
    -78  -77  -92
    -78  -77  -92
    -79  -77  -91
    -79  -77  -92
    -79  -77  -89
    -80  -77  -90
    -79  -77  -88
    -78  -77  -95
    -77  -77  -92
    -77  -77  -90
    -79  -77  -91
    -77  -77  -88
    -78  -77  -90
    -78  -77  -90
    -78  -77  -96
    -79  -77  -90
    -77  -77  -87];
figure(1)
plot((1:size(V,1)), V)
legend(C, 'Location','W')

MATLAB: How to plot level curves f(x,y)=yln(x)+xln(y) through point (1,1)

You know what f(x,y) is when x=y=1.

help meshgrid
help contour

So then it is trivial to plot the contour that goes through the indicated point. 3 lines of code. Read the help.

But I won't do your homework. You need to make an effort. I'll make a deal though. If you are willing to seriously try something. Show what you did. Then I'll consider showing you the 3 lines that produced that plot.

Best Answer

Related Solutions

MATLAB: Plotting 2D Sensor data with the same value on X-axis

MATLAB: How to plot level curves f(x,y)=yln(x)+xln(y) through point (1,1)

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