How can I specify axis spacing?

I have X axis data from 15 to 30. By default it has spacing of 5, like 15,20,25,30. I want to specify spacing of 2, like 15,17,19 and so on. How can I do that? Can I use Xtick and y tick for it ? Thanks.

Answer 1

[Jan]

AxesH = axes('Xlim', [15, 30], 'XTick', 15:2:30, 'NextPlot', 'add');
plot(15:30, rand(1, 16));

[kanyvt]

Thanks, it helped.

[Stelios Fanourakis]

Hi. How can someone estimate the average of y values for every interval of the x axis as you state it?

Answer 2

[Image Analyst]

If you have R2016b you can use the new xticks function:

xticks(15:2:30);
yticks(0:5:100); % Whatever....

Or with versions R2014b - R2016a:

ax=gca
ax.XTick = 15:2:30;
ax.YTick = 0:5:100;

[kanyvt]

Thanks but unfortunately mine is MATLAB 2014a

[Kamil Haziq]

How to do the same thing for time variables? For example from 00:00:00 to 01:00:00 . I want it to be in 15 minute intervals. 00:15:00 00:30:00 and so on.

[kanyvt]

Hey Kamil,

Can you send the pic/image of your graph? I will take a look and try to help.

Thanks,

Answer 3

[Geoff Hayes]

kanyvt - see specify axis tick values for details on how to set the ticks and labels.

Answer 4

[A N]

I've got other question. I've got chart of bending moments of the beam. Between x=0 and x=0.6 the moments are described by the parabolic function. But in the chart it seems like a linear function. How can I specify (make smaller) distance betweeen YTicks or change units on Y-Axis to make clear that is quadratic function of bending moments? %set(gca,'ytick',[-0.27:0.05:0.02]) or something like that doesn't help.

[Geoff Hayes]

AN - please post this as a comment to the above question or as a new question. Do not use the answer option to ask a new question...

[Marcelo Andrés Acuña]

I found this way:

xticks(8:2:20); % Spaces = 2

yticks(-0.5:0.1:0.5); %Spaces = 0.1

axis([8 20 -0.5 0.5]) %View axis

[Ibrahim Elayan]

Good day

How can i get this FORM of spacing on x axis and y axis in certain interval and other interval keep in normal spacing?

[Geoff Hayes]

Ibrahim - what do you consider to be normal spacing?

[P Velani]

@Ibrahim Elayan: Issue is of not plotting but of computaion. Compute X and Y values at closer interval.

e.g. If X = 1:10 and you have Y = X^2 the plot will look linear. Instead try X =1:0.1:10 and plot it you will find more accurate curve compare to earlier.

I hope this will help you.

[Image Analyst]

@Ibrahim Elayan, try this:

period = 0.1
t = linspace(0, 0.675, 1008);
% Prepare amplitude.  Goes from 2.5 to 1 during the first period
% then is 1 after that.
amplitude = ones(1, length(t)); % Initize
p1 = round(length(t)/6);
amplitude(1:p1) = linspace(2.5, 1, p1);
% Make signal.
y = amplitude .* sin(2 * pi * t / period);
% Plot signal
plot(t, y, 'b-', 'LineWidth', 2);
grid on;
xlabel('t');
ylabel('y');