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# Plotyy Display Gridlines Axis

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T on 17 Oct 2013
Commented: DadPunsAreBadPuns on 17 Jul 2020
I am using plotyy, I managed to show the grid for the function on the left using 'grid on', but how do I show the gridlines using the function on the right?
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DadPunsAreBadPuns on 17 Jul 2020
Whyyaxis question? Because you wanted an answer!
Since plotyy is no longer recommended, here's a workaround with yyaxis. You can make it into your own %<UserProfile>%\Documents\MATLAB\ folder for future use.
close all; clear all; clc;
% Setup dummy data
x = 1:10;
y = x;
% Setup colors
line_color = [ 1 , 0 , 0 ]; % Red
alpha_value = 0.15;
grid_line_color = [ line_color , alpha_value ]; % Transparent red
% Create a figure and plot the dummy-data line
fig1 = figure(1);
ax1 = axes;
hold on;
yyaxis right;
line1 = plot( x , y , '-' , 'Color' , line_color );
myYGridHandles = plotRightYGrid( ax1 , grid_line_color );
function [ gridLineHandles ] = plotRightYGrid( axh , grid_line_color )
% Made into a function if you'd like to reuse in the future.
% The following is possibly redundant, but performed for sanity's sake
axes( axh );
yyaxis right;
% Acquire the x-axis limits to get the grid-lines' extents
xlim_right = xlim;
% Acquire the tick mark values; these can be default or specified by user
y_ticks_right = get( gca , 'YTick' );
% Plot the major Y-right grid lines
for( j = 2 : ( length( y_ticks_right ) - 1 ) )
gridLineHandles(j) = plot( [ xlim_right(1) , xlim_right(2) ] , ...
[ y_ticks_right(j) , y_ticks_right(j) ] , ...
'-' , 'Color' , grid_line_color );
end
end

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### Accepted Answer

Jonathan LeSage on 17 Oct 2013
Edited: Jonathan LeSage on 17 Oct 2013
You can select the second axis handle for the data plotted with respect to the right y-axis. If you define an output for the plotyy function, the output variable will contain the figure axes handles in a vector. You can then use the set function to define the 'Xgrid' and 'Ygrid' states as 'on'.
For example:
% Outputs of the plotyy are the axes handles (in a vector) and each line handle
[haxes,hline1,hline2] = plotyy(t,z1,t,z2,'semilogy','plot');
% Turn the grid for the second axis on
set(haxes(2),'Xgrid','on')
set(haxes(2),'Ygrid','on')
Check out the documentation for more information on the set function:
##### 2 CommentsShowHide 1 older comment
Cris LaPierre on 19 Dec 2018
It does not appear to be possible to add a grid line to the right axis when plotting using yyaxis.
My source is the documentation page for yyaxis > Algorithms:
Grid Lines
Grid lines correspond with the tick mark locations along the left y-axis.

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