sqaure of number xlabel

I am using matlab 2019b

I am plotting two data one on x axis and one on y axis data

x=(25:25:625).^2

I want to plot on x axis 25^2 , 50^2 , 75^2.......625^2

But I dont know how to do that,Please some one can help me with this

I did tries with xtick but its not properly displaying.

Answer 1

[Ameer Hamza]

Try something like this

x = (25:25:625).^2;
y = sqrt(x);
plot(x, y)

xticks(x)
xticklabels(compose('%d^2', 25:25:625))

[dpb]

Other than will be way too many ticks to be able to show; particularly on the LH side of the axes as the spacing isn't linear...

I had written and was just going to post

x=[25:25:625];                               % took the square off here...
plot(x.^2,rand(size(x)))                     % plot v x^2
xlim([x(1) x(end)].^2)                       % limits won't match by default
xticks([x(1:5:end) x(end)].^2)               % subset of ticks so won't overlap
xticklabels(num2str(sqrt(xticks).','%d^2'))  % label subset so have enough room to show

Slightly different of same idea...the key is the documentation for TeX formatting is under the 'Interpreter' named parameter for the text function. Hard to find if don't already know that.

[Ameer Hamza]

But using this method does not ensure that the xticks always appear at an integer location. Displaying floating point with %d does not appear so good. May using round()

xticklabels(num2str(round(sqrt(xticks)).','%d^2'))

but then there will be a bit of imprecision. Therefore, i thought that allowing the user to specify the location manually will be an easy solution.

[dpb]

"does not ensure that the xticks always appear at an integer location"

Of course they'll be integer...auto-scaling axes of large numbers will never put a tick at a noninteger value and integers up to a very large number are exactly representable in a double.

But, I see when I cut and pasted from the command window I inadvertentedly deleted a wanted step so good catch on that...that step was:

xticks([x(1:5:end) x(end)].^2)

to pick the lesser number and to match the previously-set xlim values...fixed earlier comment to include.

[Ameer Hamza]

Yes, this makes more sense now.