Creating Library with App Designer

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Esin Derin
Esin Derin 2019-12-22
评论： Adam Danz 2019-12-28
value = app.ISBNEditField.Value;
ISBN=app.ISBNEditField.Value;
BOOKS=app.BOOKSListBox.Value;
GetBook=app.GetBookButton;
Information=app.InformationTextArea;
GetBook=[1234 1235 1236 1237];
Books=input('Anna Karenina,Les Miserables,War and Peace,Of Mice and Man','s');
function output=Library
if a == 1234
Information = 'Anna Karena';
elseif a == 1235
Information = 'Les Miserables';
elseif a == 1236
Information = 'War and Peace';
elseif a == 1237
Information = 'Of Mice and Men';
else
Information = 'not available';
end
app.InformationTextAreaLabel.Text = 'not available right now';
for i = 1 : length(app.BOOKSlist.Items)
if ISBN == app.BOOKSlist.Items(i)
app.InformationTextAreaLabel.Text = string(i);
break;
end
end
end
for app.GetBookButton=1234
app.InformationTextArea.Author=='Tolstoy';
app.InformationTextArea.Pages=='1000';
if app.GetBookButton==1235
app.InformationTextArea.Author=='Hugo';
app.InformationTextArea.Pages=='416';
for app.GetBookButton==1236
app.InformationTextArea.Author=='Tolstoy';
app.InformationTextArea.Pages='516';
for app.GetBookButton=1237
app.InformationTextArea.Author=='John Steinbeck';
app.InformationTextArea.Pages=='187';
end
end
It keeps giving me this error:
Error using Library
Error: File: Library.mlapp Line: 53 Column: 16
Unexpected MATLAB operator.
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Esin Derin
Esin Derin 2019-12-24
app.InformationTextArea.Author=='Tolstoy';
app.InformationTextArea.Pages=='1000';
With equal signs.
Esin Derin
Esin Derin 2019-12-24
Defined a function with two variables but this isn't working either.No error,just not working.
function output = my_output(x,y)
ISBN=app.ISBNEditField.Value;
BOOKS=app.BOOKSListBox.Value;
% it affect app getbookbutton to getbookbutton
GetBook=app.GetBookButton;
Information=app.InformationTextAreaLabel.Text;
GetBook=[1234, 1235 ,1236, 1237];
% this function output the information of book
% count number of enter books
for i = 1 : length(app.BOOKSlist.Items)
if ISBN == app.BOOKSlist.Items(i)
app.InformationTextAreaLabel.Text = string(i);
break;
end
if app.GetBookButton==1234
app.InformationTextArea.Author='Tolstoy';
app.InformationTextArea.Pages='1000';
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif app.GetBookButton==1235
app.InformationTextArea.Author='Hugo';
app.InformationTextArea.Pages='416';
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif app.GetBookButton==1236
app.InformationTextArea.Author='Tolstoy';
app.InformationTextArea.Pages='516';
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif app.GetBookButton==1237
app.InformationTextArea.Author='John Steinbeck';
app.InformationTextArea.Pages='187';
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif output('not information for author','not information')
end
end

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采纳的回答

Adam Danz
Adam Danz 2019-12-26
When comparing strings or char arrays, use strcmp() instead of A==B. Also, to combine conditions, use && as shown below.
if app.GetBookButton==1235 && ...
strcmp(app.InformationTextArea.Author, 'Hugo') &&...
strcmp(app.InformationTextArea.Pages, '416')
strcmp() is case-sensitive. For case insensivitity, use strcmpi().
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Esin Derin
Esin Derin 2019-12-27
function output = my_output(x,y)
ISBN=app.ISBNEditField.Value;
BOOKS=app.BOOKSListBox.Value;
% it affect app getbookbutton to getbookbutton
GetBook=app.GetBookButton;
Information=app.InformationTextAreaLabel.Text;
GetBook=[1234, 1235 ,1236, 1237];
% this function output the information of book
% count number of enter books
for i = 1 : length(app.BOOKSlist.Items)
if ISBN == app.BOOKSlist.Items(i)
app.InformationTextAreaLabel.Text = string(i);
break;
end
if app.GetBookButton==1234
strcmp(app.InformationTextArea.Author,'Tolstoy')
strcmp(app.InformationTextArea.Pages,'1000')
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif app.GetBookButton==1235
strcmp(app.InformationTextArea.Author,'Hugo')
strcmp(app.InformationTextArea.Pages,'416')
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif app.GetBookButton==1236
strcmp(app.InformationTextArea.Author,'Tolstoy')
strcmp(app.InformationTextArea.Pages,'516')
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif app.GetBookButton==1237
strcmp(app.InformationTextArea.Author,'John Steinbeck')
strcmp(app.InformationTextArea.Pages,'187')
output(app.InformationTextArea.Author,app.InformationTextArea.Pages)
elseif output('not information for author','not information')
end
end
end
Adam Danz
Adam Danz 2019-12-28
What is the entire copy-pasted error message?
What are the values of the variables producing the error?

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