I am trying to use plotyy to specify the axes on a graph but I am struggling to figure out how to use it

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A Poyser 2025-2-28

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回答： A Poyser 2025-3-3

mean.xlsx

I am plotting a graph that uses semilog and plot and I want to specify the left and right axes as they use different units.

%% Set up the Import Options and import the data

opts = spreadsheetImportOptions("NumVariables", 5);

% Specify sheet and range

opts.Sheet = "Sheet1";

opts.DataRange = "Z1:AD202";

% Specify column names and types

opts.VariableNames = ["PressureMpa", "PoreDiameternm", "CumulativePoreVolumemLg", "SmoothedDVdlogDPoreVolumemLg", "OfTotalIntrusionVolume"];

opts.VariableTypes = ["double", "double", "double", "double", "double"];

% Import the data

mean = readtable("mean.xlsx", opts, "UseExcel", false);

%% Clear temporary variables

clear opts

figure

% Create axes

axes1 = axes('Parent',figure);

hold(axes1,'on');

semilogx(mean.PoreDiameternm(1:92),mean.SmoothedDVdlogDPoreVolumemLg(1:92),'DisplayName','Pore Size Distribution')

semilogx(mean.PoreDiameternm(1:92),mean.OfTotalIntrusionVolume(1:92),'LineStyle','-','Color','r','DisplayName','% Of Total Intrusion Volume');

% Activate the right side of the axes

yyaxis(axes1,'right');

set(axes1,'YColor',[0 0 0]);

% Uncomment the following line to preserve the Y-limits of the axes

% ylim(axes1,[0 0.2]);

ylabel('Smoothed dV/dlogD Pore Volume (mL/g)','Interpreter','latex')

yyaxis(axes1,'left');

% Uncomment the following line to preserve the Y-limits of the axes

% ylim(axes1,[0 0.2]);

ylabel('% Of Total Intrusion Volume','Interpreter','latex')

xlabel('Pore Diameter nm','Interpreter','latex')

hold(axes1,'off');

% Set the remaining axes properties

set(axes1,'XDir','reverse','XMinorTick','on','XScale','log');

Warning: Error in state of SceneNode.
String scalar or character vector must have valid interpreter syntax:

Any help would be greatly aprreciated

edit, made it % of total volume as opposed to cumulative volume so my problem makes a little more sense

and I reuploaded my data

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Les Beckham 2025-2-28

编辑：Les Beckham 2025-2-28

在 MATLAB Online 中打开

mean.xlsx

You can't use two different x axis scales in a yyaxis plot (linear and log).

Also, there are bigger problems than formatting your plot. All of your data is NaN.

%% Set up the Import Options and import the data
opts = spreadsheetImportOptions("NumVariables", 5);
% Specify sheet and range
opts.Sheet = "Sheet1";
opts.DataRange = "Z1:AD202";
% Specify column names and types
opts.VariableNames = ["PressureMpa", "PoreDiameternm", "CumulativePoreVolumemLg", "SmoothedDVdlogDPoreVolumemLg", "OfTotalIntrusionVolume"];
opts.VariableTypes = ["double", "double", "double", "double", "double"];
% Import the data
% mean = readtable("mean.xlsx", opts, "UseExcel", false); <<** Don't use mean as a variable name!
mn = readtable("mean.xlsx", opts, "UseExcel", false)         % It is an important Matlab function.
mn = 202x5 table
    PressureMpa    PoreDiameternm    CumulativePoreVolumemLg    SmoothedDVdlogDPoreVolumemLg    OfTotalIntrusionVolume
    ___________    ______________    _______________________    ____________________________    ______________________

        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          
        NaN             NaN                    NaN                          NaN                          NaN          

Other comments:

If you are going to use the same y limits on the two axes, why have two y axes?

You create a handle to your created figure with this line

figure1 = figure;

But then you don't use that handle when you create the axes with this

axes1 = axes('Parent',figure);

A Poyser 2025-2-28

I am a very rookie user of MatLab so I often use the GUI to generate code and then edit it. In this case I chpped out a piece of code I have been using that has been making 6 figures but I am only intereted in one of them (figure6) but I forgot to remove that line in the question.

Les Beckham 2025-2-28

编辑：Les Beckham 2025-2-28

Unless you provide valid data (non-NaN), you are going to have a hard time getting help with plotting it. Did you read all of my comments? Your updated code has not addressed all of those issues.

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Answer 1

A Poyser 2025-3-3

在 MATLAB Online 中打开

mean.xlsx

Here is how I solved it

%% Set up the Import Options and import the data

opts = spreadsheetImportOptions("NumVariables", 5);

% Specify sheet and range

opts.Sheet = "Sheet1";

opts.DataRange = "Z1:AD202";

% Specify column names and types

opts.VariableNames = ["PressureMpa", "PoreDiameternm", "CumulativePoreVolumemLg", "SmoothedDVdlogDPoreVolumemLg", "OfTotalIntrusionVolume"];

opts.VariableTypes = ["double", "double", "double", "double", "double"];

% Import the data

mean = readtable("mean.xlsx", opts, "UseExcel", false);

% Clear temporary variables

clear opts

%% Create figure

figure;

% Activate left y-axis

yyaxis left;

semilogx(mean.PoreDiameternm(1:92), mean.SmoothedDVdlogDPoreVolumemLg(1:92), '-b', 'DisplayName', 'Pore Size Distribution');

ylabel('Smoothed dV/dlogD Pore Volume (mL/g)','Interpreter','latex');

% Activate right y-axis

yyaxis right;

semilogx(mean.PoreDiameternm(1:92), mean.OfTotalIntrusionVolume(1:92), '-r', 'DisplayName', '\% Of Total Intrusion Volume');

ylabel('\% Of Total Intrusion Volume','Interpreter','latex');

% Ensure both y-axes are black

yyaxis left;

set(gca, 'YColor', 'k');

yyaxis right;

set(gca, 'YColor', 'k');

% General plot settings

xlabel('Pore Diameter (nm)','Interpreter','latex');

set(gca, 'XDir', 'reverse', 'XMinorTick', 'on', 'XScale', 'log', 'YColor', 'k');

legend('Location','northwest','Interpreter','latex');

hold off;

●

with the help of chat gpt

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I am trying to use plotyy to specify the axes on a graph but I am struggling to figure out how to use it

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