Matlab Report Generator (Unknown Error to me)

Hi,

This is a section of my code in which Matlab 100% throws an error that I don;t know why and how. Can anyone give me some suggestions?

beamprop([0 0;0.406 0;0.406 0.203;0.403 0.203;0.403 0.003;0.003 0.003;0.003 0.203;0 0.203],[],[]);

function [final,coor]=beamprop(coor,knowndim,points)
arguments
    coor(:,2,1)sym
    knowndim(:,5,1)sym % [area xbar ybar Ix Iy]
    points(:,2,1)sym
end

final=sym(zeros(6,1));  % [area xbar ybar Ix Iy Ixy]
if size(coor,1)~=0
    try
        double(coor);
    catch
        syms x;
    end
    prop=sym(zeros((size(knowndim,1)+1),5));
    if size(knowndim,1)~=0
        prop(2:end,:)=knowndim;
    end
    A=sym(zeros(size(coor,1),1));
    Q=[A A]; % 1st moment of area
    I=[A A A]; % 2nd moment of area
    figure;
    hold on;
    for ct=1:(size(coor,1)-1)
        A(ct)=coor(ct,1)*coor((ct+1),2)-coor(ct,2)*coor((ct+1),1);
        t=coor(ct,1)*coor((ct+1),2)-coor((ct+1),1)*coor(ct,2);
        Q(ct,1)=(coor(ct,1)+coor((ct+1),1))*t;
        Q(ct,2)=(coor(ct,2)+coor((ct+1),2))*t;
        plot([coor(ct,1);coor((ct+1),1)],[coor(ct,2);coor((ct+1),2)],'k');
    end
    A(end)=coor(end,1)*coor(1,2)-coor(end,2)*coor(1,1);
    t=coor(end,1)*coor(1,2)-coor(1,1)*coor(end,2);
    Q(end,1)=(coor(end,1)+coor(1,1))*t;
    Q(end,2)=(coor(end,2)+coor(1,2))*t;
    plot([coor(end,1);coor(1,1)],[coor(end,2);coor(1,2)],'k');
    grid minor;
    hold off;
    if sign(sum(A))==-1
        Q=-Q;
        A=-A;
    end
    prop(1,1)=simplify(sum(A)/2);
    Qx=sum(Q(:,1))/6;
    prop(1,2)=simplify(Qx/prop(1,1));
    Qy=sum(Q(:,2))/6;
    prop(1,3)=simplify(Qy/prop(1,1));
    prop(1,4)=sum(I(:,1))/12-prop(1,1)*prop(1,3)^2;
    prop(1,5)=sum(I(:,2))/12-prop(1,1)*prop(1,2)^2;
    final(1)=simplify(sum(prop(:,1)));
    final(2)=simplify(sum(prop(:,1).*prop(:,2))/final(1));
    final(3)=simplify(sum(prop(:,1).*prop(:,3))/final(1));
    coor(:,1)=coor(:,1)-final(2);
    coor(:,2)=coor(:,2)-final(3);
    for ct=1:(size(coor)-1)
        t=coor(ct,1)*coor((ct+1),2)-coor((ct+1),1)*coor(ct,2);
        I(ct,1)=t*(coor(ct,2)^2+coor(ct,2)*coor((ct+1),2)+coor((ct+1),2)^2);
        I(ct,2)=t*(coor(ct,1)^2+coor(ct,1)*coor((ct+1),1)+coor((ct+1),1)^2);
        I(ct,3)=t*(coor(ct,1)*coor((ct+1),2)+coor((ct+1),1)*coor(ct,2)+2*coor(ct,1)*coor(ct,2)+2*coor((ct+1),1)*coor((ct+1),2));
    end
    t=coor(end,1)*coor(1,2)-coor(1,1)*coor(end,2);
    I(end,1)=t*(coor(end,2)^2+coor(end,2)*coor(1,2)+coor(1,2)^2);
    I(end,2)=t*(coor(end,1)^2+coor(end,1)*coor(1,1)+coor(1,1)^2);
    I(end,3)=t*(coor(end,1)*coor(1,2)+coor(1,1)*coor(end,2)+2*coor(end,1)*coor(end,2)+2*coor(1,1)*coor(1,2));
    final(4)=simplify(sum(I(:,1))/12);
    final(5)=simplify(sum(I(:,2))/12);
    final(6)=simplify(sum(I(:,3))/24);
    points(:,1)=points(:,1)-final(2);
    points(:,2)=points(:,2)-final(3);
    coor=[coor;points];
elseif size(coor,1)==0 && size(knowndim,1)~=0 && size(points,1)~=0
    final(1)=sum(knowndim(:,1));
    final(2)=sum(knowndim(:,1).*knowndim(:,2))/final(1);
    final(3)=sum(knowndim(:,1).*knowndim(:,3))/final(1);
    final(4)=sum(knowndim(:,4)+knowndim(:,1).*(knowndim(:,3)-final(3)).^2);
    final(5)=sum(knowndim(:,5)+knowndim(:,1).*(knowndim(:,2)-final(2)).^2);
    final(6)=sum(knowndim(:,1).*(knowndim(:,2)-final(2)).*(knowndim(:,3)-final(3)));
    points(:,1)=points(:,1)-final(2);
    points(:,2)=points(:,2)-final(3);
    coor=points;
else
    error('Error! No inputs detected!');
end
import mlreportgen.report.* 
import mlreportgen.dom.* 
rpt = Report('Cross Section','pdf'); 
tp=TitlePage; 
tp.Title='Cross Sectional Properties'; 
tp.Subtitle='Area, Centroids and Second Moments of Area'; 
tp.Author = 'Angus'; 
add(rpt,tp);
ch1=Chapter; 
ch1.Title='Cross Section'; 
sec1=Section; 
sec1.Title='Graph of Cross Section'; 
add(sec1,Figure);
add(ch1,sec1);
close gcf;
sec2=Section; 
sec2.Title = 'Numeric Properties of the Cross Section'; 
para=Paragraph(sprintf('Area = %g',final(1))); 
add(sec2,para);
add(ch1,sec2);
add(rpt,ch1); % error occured here.
close(rpt);
rptview(rpt);
end

Error thrown in the Command Window:

Error using mlreportgen.report.Figure/createSnapshotFigure
Figure is invalid. Please use valid path of the figure file or valid figure handle

Error in mlreportgen.report.Figure/getSnapshotImageImpl

Error in mlreportgen.report.Figure/getContent

Error in mlreportgen.report.ReportForm/fillHole

Error in mlreportgen.report.ReporterBase/processHole

Error in mlreportgen.report.ReportForm/fillForm

Error in mlreportgen.report.ReporterBase/getDocumentPart

Error in mlreportgen.report.ReporterBase/getImpl

Error in mlreportgen.report.internal.LockedForm.add

Error in mlreportgen.report.internal.LockedForm.add

Error in mlreportgen.report.ReportForm/fillHole

Error in mlreportgen.report.Section/processHole

Error in mlreportgen.report.ReportForm/fillForm

Error in mlreportgen.report.ReporterBase/getDocumentPart

Error in mlreportgen.report.ReporterBase/getImpl

Error in mlreportgen.report.Section/getImpl

Error in mlreportgen.report.internal.LockedForm.add

Error in mlreportgen.report.internal.LockedForm.add

Error in mlreportgen.report.ReportForm/fillHole

Error in mlreportgen.report.Section/processHole

Error in mlreportgen.report.Chapter/processHole

Error in mlreportgen.report.ReportForm/fillForm

Error in mlreportgen.report.ReporterBase/getDocumentPart

Error in mlreportgen.report.ReporterBase/getImpl

Error in mlreportgen.report.Section/getImpl

Error in mlreportgen.report.internal.LockedForm.add

Error in mlreportgen.report.ReportBase/add

Error in beamprop (line 103)
add(rpt,ch1);

Many thanks!

Answer 1

[Walter Roberson]

    figure;
    %....
    close gcf;

Do not do things that way. Instead record the figure() handle, and close() the handle.

Please also have a look at https://www.mathworks.com/matlabcentral/answers/?term=tag%3Aalways-parent

[Angus Wong]

Thank you so much, my code now works!