How to set the grid of the right yyaxis?

Question

Albert Bing 2020-12-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/671503-how-to-set-the-grid-of-the-right-yyaxis

编辑： Star Strider 2020-12-1

I have a figure that has 2 yyaxis, and I want the grid shown on the right yyaxis. But the command grid on is only effective on the left yyaxis.

Sure I can just plot the lines of the grids, but the lines are on the top of the other lines or patches. The good thing of the grid is that they are always on the bottom layer, while the lines user plotted are on the top layer.

x1=[200, 300, 250, 520, 340];
x2=[0.3, 0.2, 0.12, 0.4, 0.22];
figure;
yyaxis left
bar(x1);
yyaxis right
plot(x2);
grid on

The grid is on the left yyaxis, while I want it to be of the right yyaxis. What should I do?

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KALYAN ACHARJYA 2020-12-1

编辑：KALYAN ACHARJYA 2020-12-1

Answer from MATLAB "Grid lines correspond with the tick mark locations along the left y-axis". Option plotyy

https://www.mathworks.com/matlabcentral/answers/436365-anyway-to-add-grid-based-on-right-yyaxis#answer_353062

Albert Bing 2020-12-1

Thanks for the answer.

I checked the 2 solutions.

1. plotyy is not recommended since R2016a and it doesn't seem to apply to the bar command or patches.

2. yyaxis command gives the axes 2 YAxis but only one YGrid. And it always worked on the left yyaxis.

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Answer 1

Star Strider 2020-12-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/671503-how-to-set-the-grid-of-the-right-yyaxis#answer_561648

编辑：Star Strider 2020-12-1

在 MATLAB Online 中打开

Another option is to create new right-axis tick positions to match the tick positions on the left:

x1=[200, 300, 250, 520, 340];
x2=[0.3, 0.2, 0.12, 0.4, 0.22];
figure;
yyaxis left
bar(x1)
ytl = get(gca, 'YTick');                                    % Get Controlling Left Ticks
yyaxis('right');
plot(x2)
ytr = get(gca, 'YTick');                                    % Get Right Tick Values
ytrv = linspace(min(ytr), max(ytr), numel(ytl));            % Create New Right Tick Values Matching Number Of Left Ticks
ytrc = compose('%.2f',ytrv);                                % Tick Label Cell Array
set(gca, 'YTick',ytrv, 'YTickLabel',ytrc)                   % Set New Right Tick Labels
grid on

producing:

.

EDIT — (1 Dec 2020 at 17:48)

To get ticks and tick labels with more rational spacing:

x1=[200, 300, 250, 520, 340];
x2=[0.3, 0.2, 0.12, 0.4, 0.22];
figure;
yyaxis left
bar(x1)
ytl = get(gca, 'YTick');                                    % Get Controlling Left Ticks
yyaxis('right');
plot(x2)
ytr = get(gca, 'YTick');                                    % Get Right Tick Values
tinc = diff(ylim)/numel(ytl);                               % Tick Increment
ytrv = min(ylim):tinc:(tinc*(numel(ytl)+1));
ylim([min(ytrv) max(ytrv)])                                 % Set New ‘ylim’
ytrc = compose('%.2f',ytrv);                                % Tick Label Cell Array
set(gca, 'YTick',ytrv, 'YTickLabel',ytrc)                   % Set New Right Tick Labels
grid on

producing:

.

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Albert Bing 2020-12-1

Thanks very much!

The aligned yyaxis solusion is better. The codes might be run on some older versions of MATLAB.

Star Strider 2020-12-1

As always, my pleasure!

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Answer 2

Adam Danz 2020-12-1

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/671503-how-to-set-the-grid-of-the-right-yyaxis#answer_561643

编辑：Adam Danz 2020-12-1

在 MATLAB Online 中打开

As KALYAN ACHARJYA mentioned, the grid lines reference the left axis.

Workaround

Set the vertical grid lines

ax = gca(); 
ax.XGrid = 'on'; 

set the horizontal grid lines using yline after setting the ytick and ylim. If the ylim or yticks change, the horizontal reference lines will not update. You could add a listener to fix that. Also, the horizonal lines will always be on top. To put them on the bottom see this answer.

yyaxis right

ylim([-1,3])

ax.YTick = -1:.5:3;

yl = arrayfun(@(y)yline(ax, y,'LineStyle',ax.GridLineStyle,'Color',ax.GridColor,'Alpha',ax.GridAlpha),ax.YTick);

●

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Albert Bing 2020-12-1

After a second thought, your solution might be better. Since the grid is the really "grid", located at the right position, like 0.5, 1.0, 1.5 etc. other than 0.16, 0.22 which are not so obvious for readers.

But I have to run the code on MATLAB older than R2018a. So I can't use xline or yline.

I might have to drop the grid.

Adam Danz 2020-12-1

编辑：Adam Danz 2020-12-1

在 MATLAB Online 中打开

You can use plot() or line() instead of yline(). The main difference is that yline will always extend to the axis edges but if xlim is changed then lines produced by plot() or line() may no longer extend to the axis edges. You could over-estimate the edges to mitigate that problem.

Example:

yyaxis right

ax = gca();

ax.XGrid = 'on';

ylim([-1,3])

xl = xlim();

xlExtended = xl + [-range(xl), range(xl)]; % Optional

ax.YTick = -1:.5:3;

hold(ax, 'on')

yl = plot(ax, xlExtended,[ax.YTick',ax.YTick'] ,'LineStyle',ax.GridLineStyle,'Color',[ax.GridColor, ax.GridAlpha],'Marker','none');

xlim(xl)

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