setting xaxis labels to only integers

Question

nina 2025-6-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2177731-setting-xaxis-labels-to-only-integers

评论： Mathieu NOE 2025-6-13

采纳的回答： Mathieu NOE

在 MATLAB Online 中打开

Hello,

I have a plot where I am trying to make it so that the xaxis is going to be integers and steps of 1.

figure();
           
adcValues_flipped = flip(adcValues);
xlabels_flipped = flip(num2str(x_mm_flipped));
b0_flipped = flip(b0Values);
plot(1:numel(x_mm), adcValues_flipped);
set(gca, 'XTick', 1:numel(x_mm), 'XTickLabel', xlabels_flipped);

Right now the code about gives me an xaxis labels of the following:

    '-4.95'
    ' -4.5'
    '-4.05'
    ' -3.6'
    '-3.15'
    ' -2.7'
    '-2.25'
    ' -1.8'
    '-1.35'
    ' -0.9'
    '-0.45'
    '    0'
    '    0'
    '    0'
    '    0'
    '    0'
    '    0'
    ' 0.45'
    '  0.9'
    ' 1.35'
    '  1.8'
    ' 2.25'
    '  2.7'
    ' 3.15'
    '  3.6'
    ' 4.05'
    '  4.5'
    ' 4.95'
    '  5.4'
    ' 5.85'

Where I would instead like it to be -5, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6 as the xaxis labels and ticks.

Any ideas?

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Answer 1

Mathieu NOE 2025-6-12

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在 MATLAB Online 中打开

hello

using your data I tried to reproduce your plot in figure 1

the modified plot is figure 2

hope it helps !

x_mm = [-4.95

-4.5

-4.05

-3.6

-3.15

-2.7

-2.25

-1.8

-1.35

-0.9

-0.45

0

0.45

0.9

1.35

1.8

2.25

2.7

3.15

3.6

4.05

4.5

4.95

5.4

5.85];

adcValues_flipped = 1+0.25*sin(x_mm);

% remove duplicates

[x_mm,ind] = unique(x_mm);

adcValues_flipped = adcValues_flipped(ind);

figure(1) % your plot

plot(x_mm, adcValues_flipped);

set(gca, 'XTick', x_mm, 'XTickLabel', num2str(x_mm));

●

figure(2) % modified plot

xi = floor(min(x_mm)):1:ceil(max(x_mm));

plot(x_mm, adcValues_flipped);

set(gca, 'XTick', xi, 'XTickLabel', num2str(xi'));

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Mathieu NOE 2025-6-12

在 MATLAB Online 中打开

so using the same logic , adapted to your new data , this is what I could suggest :

%% create the data

x_mm = [-4.95

-4.5

-4.05

-3.6

-3.15

-2.7

-2.25

-1.8

-1.35

-0.9

-0.45

0

0.45

0.9

1.35

1.8

2.25

2.7

3.15

3.6

4.05

4.5

4.95

5.4

5.85];

adcValues = 1+0.25*sin(x_mm); % dummy Adc readings

ind = abs(x_mm)<eps;

adcValues(ind) = 0; % create the 0 Adc values

%% create new x vector

indXzero = find(abs(x_mm)<eps);

xspacing_zero = 1; % delta x spacing between zero values

xspacing_zero_array = linspace(-xspacing_zero/2,xspacing_zero/2,numel(indXzero));

x_mm_new = x_mm;

x_mm_new(indXzero) = xspacing_zero_array;

% shift left hand side non zero x values (to have correct spacing)

indleft = (1:min(indXzero)-1);

x_mm_new(indleft) = x_mm(indleft) + xspacing_zero_array(1);

% shift right hand side non zero x values (to have correct spacing)

indright = (max(indXzero)+1:numel(x_mm));

x_mm_new(indright) = x_mm(indright) + xspacing_zero_array(end);

% plot

xlabels = num2str(x_mm); % plot "true" x_mm values at the specified ticks positions

%% plots

figure(1) % your original plot

plot(x_mm_new,adcValues,'-*');

set(gca,'XTick',x_mm_new,'XTickLabel',xlabels);

figure(2) % modified plot

xi = floor(min(x_mm_new)):1:ceil(max(x_mm_new));

plot(x_mm_new, adcValues,'-*');

set(gca, 'XTick', xi, 'XTickLabel', num2str(xi'));

Mathieu NOE 2025-6-13

在 MATLAB Online 中打开

oh yes I am sorry , my bad ,

try this instead : I have now plotted the two on the same figure to make sure the problem is now solved

NB that your "original" plot looks also a bit different as I also apply a unitary x spacing for it (and that is fortunate, otherwise the comparison with the modified plot becomes quite problematic !)

clc

clearvars

%% create the data

x_mm = [-4.95

-4.5

-4.05

-3.6

-3.15

-2.7

-2.25

-1.8

-1.35

-0.9

-0.45

0

0.45

0.9

1.35

1.8

2.25

2.7

3.15

3.6

4.05

4.5

4.95

5.4

5.85];

adcValues = 1+0.25*sin(x_mm); % dummy Adc readings

ind = abs(x_mm)<eps;

adcValues(ind) = 0; % create the 0 Adc values

%% create new x vector

indXzero = find(abs(x_mm)<eps);

xspacing_zero_array = 0:numel(indXzero)-1;

x_mm_new = x_mm;

x_mm_new(indXzero) = xspacing_zero_array;

% shift left hand side non zero x values (to have correct spacing)

indleft = (1:min(indXzero)-1);

x_mm_new(indleft) = x_mm(indleft) + xspacing_zero_array(1);

% shift right hand side non zero x values (to have correct spacing)

indright = (max(indXzero)+1:numel(x_mm));

x_mm_new(indright) = x_mm(indright) + xspacing_zero_array(end);

% original plot labels

xlabels = num2str(x_mm); % plot "true" x_mm values at the specified ticks positions

% new plot x labels

xi_left = (floor(min(x_mm)):-1);

xi_right = (1:ceil(max(x_mm)));

xi = [xi_left zeros(1,numel(indXzero)) xi_right] ;

xi_labels = num2str(xi');

xi_ticks = [xi_left (0:numel(indXzero)-1) xi_right+numel(indXzero)-1] ;

%% plots

figure(1)

% your original plot

subplot(2,1,1)

plot(x_mm_new,adcValues,'-*');

set(gca,'XTick',x_mm_new,'XTickLabel',xlabels);

grid on

% modified plot

subplot(2,1,2)

plot(x_mm_new,adcValues,'-*');

set(gca, 'XTick', xi_ticks, 'XTickLabel', xi_labels);

grid on

nina 2025-6-13

You’re an angel! Thank you 🎉🎉🎉

Mathieu NOE 2025-6-13

thank you for the nice words !!

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Answer 2

Katy Weihrich 2025-6-12

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此回答的直接链接

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在 MATLAB Online 中打开

x_mm = [-4.95 -4.5 -4.05 -3.6 -3.15 -2.7 -2.25 -1.8 -1.35 -0.9 -0.45 0 0 0 0 0 0 0.45 0.9 1.35 1.8 2.25 2.7 3.15 3.6 4.05 4.5 4.95 5.4 5.85]';

% round x_mm to get to integers

x_mm_round = round(x_mm);

% get the absolute of the difference between x_mm and x_round. It should be

% below a vertein value (in this case 0.2) for all the values that are

% closest to or are a certain integer

idx = abs(x_mm-x_mm_round) < 0.2;

% remove the ticks that you are not interested in

fig_xticks = 1:numel(x_mm);

fig_xticks = fig_xticks(idx);

% create the corresponding xticklables

fig_xticklabels = num2str(x_mm);

% you could insert x_mm_round here instead to get the integers,

% but I would not recomment this, since it creates untruthfull labeling of the data

% if you would like to use integers here you would need to recalculate the tick positions

fig_xticklabels = fig_xticklabels(idx,:);

figure; axes; xlim([1 numel(x_mm)])

set(gca,'XTick',fig_xticks,'XTickLabel',fig_xticklabels,'XTickLabelRotation',90)

●

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Katy Weihrich 2025-6-12

在 MATLAB Online 中打开

Alternativly, if you would like to keep the ticks ,you can use:

x_mm = [-4.95 -4.5 -4.05 -3.6 -3.15 -2.7 -2.25 -1.8 -1.35 -0.9 -0.45 0 0 0 0 0 0 0.45 0.9 1.35 1.8 2.25 2.7 3.15 3.6 4.05 4.5 4.95 5.4 5.85]';

x_mm_round = round(x_mm);

idx = abs(x_mm-x_mm_round) < 0.2;

fig_xticks = 1:numel(x_mm);

fig_xticklabels = num2str(x_mm);

fig_xticklabels(~idx,:) = ' ';

figure; axes; xlim([1 numel(x_mm)])

set(gca,'XTick',fig_xticks,'XTickLabel',fig_xticklabels,'XTickLabelRotation',90)

●

nina 2025-6-12

But how would i do the rounding? Unforunately I already know how to make a plot like you did but am still running into the issue where i want the integers

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setting xaxis labels to only integers

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setting xaxis labels to only integers

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