Non-uniform axis spacing in a plot

Hi all,

I have two vectors: A = [0.5,0.65,0.7,0.66,0.81] and B = [5,10,20,100,1000]

I would like to plot A on the y-axis and B on the x-axis, so that the x-axis has a UNIFORM spacing of the 5 elements in B. Instead, if I simply use plot(B,A) I obtain the usual Matlab plot, in which the point 5,10,20,100 are very close one to the other on the x-axis, while 1000 is very distant.

How can I make this plot, having uniform spacing between the distante values in B?

Thanks

[madhan ravi]

xlim([0 1000])
xticks(linspace(min(B),max(B),numel(B)))

[Gianluca Ligresti]

Sorry, probably I didn't explain well my problem.

On the x-axis I want to have ONLY the values 5, 10, 20, 100, 1000

Corresponding to 5 I want have 0.5 on the y-axis

Corresponding to 10 I want have 0.65 on the y-axis and so on

But I would like to have on the x-axis an equal distance between the value 5 and 10, between 10 and 20 I would have the same distance, between 20 and 100 I would have the same distance and so on

Answer 1

[Steven Lord]

About the only way you'll be able to get what you want is to lie a little bit.

A = [0.5,0.65,0.7,0.66,0.81];
B = [5,10,20,100,1000];

Plot the A data with X coordinates 1, 2, ... instead of the data in B. Don't worry, we'll use B soon.

plot(A);

Show only the ticks corresponding to those integer coordinates.

xticks(1:length(A));

Set the labels for those ticks to be the elements in B.

xticklabels(string(B))

Answer 2

[Star Strider]

Try this:

x = 10.^(rand( 1, 20)*3);                                               % Create Data
y = rand(1, 20);                                                        % Create Data

A = [0.5,0.65,0.7,0.66,0.81];
B = [5,10,20,100,1000];

figure
plot(x, y, 'p')
set(gca, 'XScale','log', 'XTick',B, 'XTickLabel',B, 'YTick',sort(A))

The x-axis spacing is not absolutely uniform, however this is as likely as close as it is possible to get to what you want.

Answer 3

[KSSV]

Do interpolation....read about interp1

A = [0.5,0.65,0.7,0.66,0.81] ;
B = [5,10,20,100,1000] ;

plot(B,A,'*r')
hold on
Bi = linspace(min(B),max(B),100) ; % or you may use Bi = min(B):10:max(Bi)
Ai = interp1(B,A,Bi) ;

plot(Bi,Ai,'.-b')

[Gianluca Ligresti]

Sorry, probably I didn't explain well my problem.

On the x-axis I want to have ONLY the values 5, 10, 20, 100, 1000

Corresponding to 5 I want have 0.5 on the y-axis

Corresponding to 10 I want have 0.65 on the y-axis and so on

But I would like to have on the x-axis an equal distance between the value 5 and 10, between 10 and 20 I would have the same distance, between 20 and 100 I would have the same distance and so on

[KSSV]

That what the bove code does....or may be this fileexchange might be of your interest:

https://in.mathworks.com/matlabcentral/fileexchange/34874-interparc

Answer 4

[Jianye Xu]

Firstly, turn x-data to categorical data. Then, use plot():

A = [0.5,0.65,0.7,0.66,0.81];
B = [5,10,20,100,1000];

B_cat = categorical(B);

figure
plot(B_cat,A)

Hope that helps.