MATLAB: Error, matrix dimension must agree

Question

            Voc = app.LinetolinevoltageVocEditField.Value;
            Ioc = app.LinetolinecurrentAocEditField.Value;
            Woc = app.ThreephasepowerkWocEditField.Value/3;
            Vsc = app.LinetolinevoltageVscEditField.Value;
            Isc = app.LinetolinecurrentAscEditField.Value;
            Wsc = app.ThreephasepowerkWscEditField.Value/3;
            Vp = app.PrimarysidelinevoltageVEditField.Value;
            Vs = app.SecondorysidelinevoltageVEditField.Value;
            
            if(app.StepdowntransformerButton.Value)
                a = Vp ./ Vs;
                if(app.DeltastarconnectionButton.Value)
                    Voc = Voc/sqrt(3);
                    pfoc = Woc/(Voc*Ioc);
                    
                    if(pfoc>=1)
                        app.errorTextArea.Value = 'Error! Power factor is more than 1!';
                    else
                        Ro = Voc/(Ioc*pfoc);
                        app.RcTextArea.Value = num2str(Ro);
                        sineoc = sin(acos(pfoc));
                        Xm = Voc/(Ioc*sineoc);
                        app.XmTextArea.Value = num2str(Xm);
                        
                        Isc = Isc/sqrt(3);
                        pfsc = Wsc/(Vsc*Isc);
                        if(pfsc>=1)
                            app.errorTextArea.Value = 'Error! Power factor is more than 1!';
                        else
                            Req = Wsc/(Isc*Isc);
                            Req = Req/(a*a);
                            app.ReqTextArea.Value = num2str(Req);
                            Zeq = Vsc/Isc;
                            Zeq = Zeq/(a*a);
                            Xeq = sqrt((Zeq*Zeq)-(Req*Req));
                            
                            app.XeqTextArea.Value = num2str(Xeq);
                        end
                        
                    end
                    

I created 2 edit fields in app designer to allow user to input values into it and the program will calculate the a of it, but for the line a = Vp ./ Vs, it keeps showing matrix dimension must agree and I am running out of idea what should I do since I am still new to Matlab, any kind advices all comments will be appreciated, thanks and sorry for wasting your time!

Answer 1

Here Vp ,Vs are of class 'char' and cannot be divided. So you have to convert them to integer format for division.Try

 a = str2num(Vp) ./ str2num(Vs);