bar() to a specific axes in GUI

But there is an easier solution: use explicit handles in your call to bar. If you read the doc, you see you have two options: specifying the axes as the first argument, or using the Name-Value pair to specify the parent axes.

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Rik 2018-11-20

在 MATLAB Online 中打开

Below you will find a minimalist example that is fully self-contained and should be close to what you want. You might notice it doesn't use GUIDE with its convoluted functions.

function thermometer
handles=createGUI;
%create C2F and F2C
handles.C2F=@(C) (C * 9/5) + 32;
handles.F2C=@(F) (F - 32) * 5/9;
guidata(handles.fig,handles)
%set initial temp to 0C
set(handles.CButton,'String','0 C')
update(handles.CButton)
end
function h=createGUI
h=struct;
h.fig=figure;
%create thermometer axis
w=0.075;%width of axis
target_ax=axes('Parent',h.fig,'Position',[0.5-w/2 0.15 w 0.7]);
h.bar=bar(0.5,0,'BaseValue', -40,'Parent',target_ax);
axis(target_ax,[0 1 -40 100])
h.target_ax=target_ax;
yyaxis right
second_ax=gca;
h.second_ax=second_ax;
axis(second_ax,[0 1 -40 212])
set(target_ax,'XTick',[])
try
    target_ax.Toolbar.Visible = 'off';
    second_ax.Toolbar.Visible = 'off';
catch
end
%create text buttons
h.CButton=uicontrol('Parent',h.fig,...
    'Style','edit',...
    'Units','Normalized',...
    'Position',[0.7 0.7 0.25 0.1],...
    'String',' C',...
    'Tag','C',...
    'Callback',@update);
h.FButton=uicontrol('Parent',h.fig,...
    'Style','edit',...
    'Units','Normalized',...
    'Position',[0.7 0.55 0.25 0.1],...
    'String',' F',...
    'Tag','F',...
    'Callback',@update);
guidata(h.fig,h)
end
function update(hObject,eventdata)
%update bar plot and text of the other input field
%grab guidata
h=guidata(hObject);
%load text to value
val=str2val(hObject.String);
%---
%this is where you should check for NaNs, or empty inputs
%---
if strcmp(hObject.Tag,'C')
    %update the bar plot without any need to convert to C
    set(h.bar,'YData',val)
    %update F text
    set(h.FButton,'String',sprintf('%.1f F',h.C2F(val)))
else
    %update bar plot (convert F to C first)
    val=h.F2C(val);
    set(h.bar,'YData',val)
    set(h.CButton,'String',sprintf('%.1f C',val))
end
end
function val=str2val(str)
%extract the value from a char array 
str( (str<48 | str>57) & str~=46)='';%remove non-number (keep .)
val=str2double(str);
end

Obadah M. 2018-11-22

编辑：Obadah M. 2018-11-22

在 MATLAB Online 中打开

Okay thank you Rik!

You have posted an improved version of the function I posted, however; I would still like to know what is causing this "bug". The whole area from 0 to -40 is red, is it another bar?

x = [0 0.5 1];
y = [0 cels 0];
bar (x, y, 'r', 'BaseValue', -40, 'LineWidth', 0.7)
set(gca, 'xtick', [], 'ytick', [])
axis([0 1 -40 120]);

Rik 2018-11-22

With the base value you indicate what should be the lower value of your bar plot. Then you choose to plot 3 bars, so you get 3 red stacks. I have already showed you what I would use as code, so I'm not going to look into big parts of your code.

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