lsline shifts the yaxis upwards

I am plotting four points:

x = [-0.13; -0.31; -1.07; -0.85] y = [-2.58; 5.21; -0.80 ; -1.14]

plot (x,y,'o')

x-axis and y-axis minimum and maximum should be same (both axes should have same scale) Here, -3 is minimum limit and 6 is maximum limit for both x and y axes.

I use lsline function to plot the least square fit line. Though both axes have same scale, however the y axis shifts upwards. ( -3 the minimum point on y axis shifted upwards)

Y-axes has less distance between the tick points. Please see the figure.

I don't know why? Please help.

Answer 1

[Paul]

add:

axis([-3 6 -3 6],'square')

after your plot command.

[Priya]

Hi

Thanks. I tried.

Its converting the figure into square shape, however there is no change in the axis shift.

I used the following code:

x = [-0.13; -0.31; -1.07; -0.85];

y = [-2.58; 5.21; -0.80 ; -1.14];

f = figure;

plot(x,y,'o')

axis([-3 6 -3 6]);

set(gca,'YTick',[-3:1:6]);

set(gca,'XTick',[-3:1:6]);

grid on

l_line = lsline;

Please see the figure.

[Paul]

You should put the axis command after the lsline command:

x = [-0.13; -0.31; -1.07; -0.85]; y = [-2.58; 5.21; -0.80 ; -1.14]
plot (x,y,'o')
grid on;
lsline
axis([-3 6 -3 6],'square')

Figure:

[Priya]

Its strange. I am using the following code strictly. Its giving the following incomplete figure.

x = [-0.13; -0.31; -1.07; -0.85];

y = [-2.58; 5.21; -0.80 ; -1.14]

plot (x,y,'o')

grid on;

lsline

axis([-3 6 -3 6],'square')

[Paul]

Running the axis command both before the lsline command and after it, fixes that:

axis([-3 6 -3 6],'square')
lsline
axis([-3 6 -3 6],'square')

[Priya]

Thanks it worked.. Why did this happen ?

[Paul]

I think it's just a bug. I tried it in Matlab r2013b and it worked with just one axis command, whereas in r2012b I had the same problem as you. I think it resizes the line from the x value of the first point to the most right point.

[Tony Ingram]

This is still happening in 2016b... how can we report this to get it fixed?