how to set axis with different interval ?

I have data look like this !

x y

3 10

5 11

7 09

10 12

20 11

30 10

40 09

90 12

you see interval between x axiz values is not same, when i plot this, initial values are plotted very close to each other which doesnt look good.

I want each to put X axis values at same distance. how can i do that ?

Answer 1

[Star Strider]

One option is to change the scale of the x-axis:

%      x    y
M = [ 3     10
      5     11
      7     09
     10     12
     20     11
     30     10
     40     09
     90     12];

figure
plot(M(:,1), M(:,2), '-p')
Ax = gca;
Ax.XTick = M(:,1);
Ax.XScale = 'log';
axis([2  100    8  13])
xlabel('x')
ylabel('y')

producing:

.

Answer 2

[Adam Danz]

Two methods below show log scale and categorical x axes.

data = [
    3      10
    5       11
    7       09
    10     12
    20     11
    30      10
    40      09
    90      12];

clf()
ax(1) = subplot(3,1,1);
plot(ax(1), data(:,1),data(:,2))
title(ax(1),'Original data')

ax(2) = subplot(3,1,2);
plot(ax(2), data(:,1),data(:,2))
ax(2).XScale = 'log';
title(ax(2),'Log scale')

ax(3) = subplot(3,1,3);
plot(ax(3), categorical(data(:,1)),data(:,2))
title(ax(3),'Categorical')