()-indexing must appear last in an index expression What is my mistake? method gauss jordan gui
3 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Erwin Avendaño
il 3 Nov 2017
Modificato: Walter Roberson
il 3 Nov 2017
function pushbutton6_Callback(hObject, eventdata, handles)
set(handles.pushbutton1, 'value');
u=1;
set(handles.pushbutton3, 'value');
u=2
set(handles.pushbutton4, 'value');
u=3
switch u
case 1
m=[str2double(get(handles.edit3,'string')) str2double(get(handles.edit4,'string'))(str2double(get(handles.edit9,'string'))); str2double(get(handles.edit10,'string')) str2double(get(handles.edit11,'string')) str2double(get(handles.edit15,'string'))];
case 2
m=[str2double(get(handles.edit3,'string')) str2double(get(handles.edit4,'string')) str2double(get(handles.edit6,'string')) (str2double(get(handles.edit9,'string'))); str2double(get(handles.edit10,'string')) str2double(get(handles.edit11,'string')) str2double(get(handles.edit12,'string')) (str2double(get(handles.edit15,'string'))); str2double(get(handles.edit16,'string')) str2double(get(handles.edit17,'string')) str2double(get(handles.edit18,'string')) str2double(get(handles.edit21,'string')) ];
case 3
case 4
otherwise
x=0
end
if all(size(m)==[2,3])
h=1
else
if all(size(m)==[3,4])
h=2
else
if all(size(m)==[4,5])
h=3
else
if all(size(m)==[5,6])
h=4
end
end
end
end
switch h
case 1
m(1,:)=m(1,:)/m(1,1);
m(2,:)=m(2,:)-(m(2,1))*(m(1,:));
m(2,:)=m(2,:)/m(2,2);
m(1,:)=m(1,:)-(m(1,2))*(m(2,:));
x1=m(1,3)
x2=m(2,3)
set(handles.edit35,'string',x1);
set(handles.edit36,'string',x2);
case 2
m(1,:)=m(1,:)/m(1,1);
m(2,:)=m(2,:)-(m(2,1))*(m(1,:));
m(3,:)=m(3,:)-(m(3,1))*(m(1,:));
m(2,:)=m(2,:)/m(2,2);
m(3,:)=m(3,:)-(m(3,2))*(m(2,:));
m(3,:)=m(3,:)/m(3,3);
m(2,:)=m(2,:)-(m(2,3))*(m(3,:));
m(1,:)=m(1,:)-(m(1,3))*(m(3,:));
m(1,:)=m(1,:)-(m(1,2))*(m(2,:));
x1=m(1,4)
x2=m(2,4)
x3=m(3,4)
set(handles.edit35,'string',x1);
set(handles.edit36,'string',x2);
set(handles.edit37,'string',x3);
case 3
x=3
case 4
x=2
otherwise
x=32
end
matlab says that this is my mistake
m=[str2double(get(handles.edit3,'string')) str2double(get(handles.edit4,'string'))(str2double(get(handles.edit9,'string'))); str2double(get(handles.edit10,'string')) str2double(get(handles.edit11,'string')) str2double(get(handles.edit15,'string'))];
0 Commenti
Risposta accettata
OCDER
il 3 Nov 2017
You can't do the following:
str2double(get(handles.edit4,'string'))(str2double(get(handles.edit9,'string')));
Did you mean to add a space between the terms? If not and you want to access the nth index of this variable, keep reading.
Unlike other languages like JAVA, you can't immediately take the output of str2double and find the value at the nth index. You need to use a temporary variable to do this kind of indexing. See this example:
a = {'1' '2' '3'}
b = '2'
c = str2double(a)(str2double(b)) % Error: ()-indexing must appear last in an index expression.
temp = str2double(a);
c = temp(str2double(b)); %no error. this works.
In your case, any string that will return a matrix should be stored in a temporary matrix.
temp = str2double(get(handles.edit4,'string'))
value = tempMat(str2double(get(handles.edit9,'string')));
If you have to extract a value using 2 edit text boxes frequently, consider making a simple function like this:
function Value = getValue(Handle1, Handle2)
Values = str2double(get(Handle1, 'string'));
Value = Values(str2double(get(Handle2, 'string')));
And whenever you want to get a value from a edit text box based on the index value of another text box, do this:
getValue(handles.edit4, handles.edit9)
0 Commenti
Più risposte (0)
Vedere anche
Categorie
Scopri di più su Structures in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!