You did not enter enough variable names.Please try again。| matlab pdemodeler导出解报错解决方案

今天学习 MATLAB 中的 pdemodeler 工具包时，遇到了下面的问题。

You did not enter enough variable names.Please try again

我的matlab版本是 R2022b

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这个bug应该是这样的：在做好一次 pdemodeler 后，选择保存文件，下次运行该文件后，无法导出解。

解决方案是：运行该文件后，再次点击 = 。重新求解之后就可以导出了

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2022年10月4日20点10分

附一个没什么用的实例

% This script is written and read by pdetool and should NOT be edited.
% There are two recommended alternatives:
% 1) Export the required variables from pdetool and create a MATLAB script
%    to perform operations on these.
% 2) Define the problem completely using a MATLAB script. See
%    https://www.mathworks.com/help/pde/examples.html for examples
%    of this approach.
function pdemodel
[pde_fig,ax]=pdeinit;
pdetool('appl_cb',1);
set(ax,'DataAspectRatio',[1 1 1]);
set(ax,'PlotBoxAspectRatio',[1.5 1 1]);
set(ax,'XLim',[-1.5 1.5]);
set(ax,'YLim',[-1 1]);
set(ax,'XTickMode','auto');
set(ax,'YTickMode','auto');

% Geometry description:
pderect([0 1 0 -0.5],'R1');
set(findobj(get(pde_fig,'Children'),'Tag','PDEEval'),'String','R1')

% Boundary conditions:
pdetool('changemode',0)
pdesetbd(4,...
'dir',...
1,...
'1',...
'0')
pdesetbd(3,...
'dir',...
1,...
'0',...
'0')
pdesetbd(2,...
'dir',...
1,...
'1',...
'0')
pdesetbd(1,...
'dir',...
1,...
'0',...
'0')

% Mesh generation:
setappdata(pde_fig,'Hgrad',1.3);
setappdata(pde_fig,'refinemethod','regular');
setappdata(pde_fig,'jiggle',char('on','mean',''));
setappdata(pde_fig,'MesherVersion','preR2013a');
pdetool('initmesh')
pdetool('refine')

% PDE coefficients:
pdeseteq(2,...
'1.0',...
'0',...
'0',...
'1.0',...
'0:0.001:0.3',...
'sin(pi*x)',...
'0.0',...
'[0 100]')
setappdata(pde_fig,'currparam',...
['1.0';...
'0  ';...
'0  ';...
'1.0'])

% Solve parameters:
setappdata(pde_fig,'solveparam',...
char('0','1000','10','pdeadworst',...
'0.5','longest','0','1E-4','','fixed','Inf'))

% Plotflags and user data strings:
setappdata(pde_fig,'plotflags',[1 1 1 1 1 1 1 1 0 0 0 301 1 0 0 0 0 1]);
setappdata(pde_fig,'colstring','');
setappdata(pde_fig,'arrowstring','');
setappdata(pde_fig,'deformstring','');
setappdata(pde_fig,'heightstring','');

% Solve PDE:
pdetool('solve')