How to pull data from a table from a file and use as a string or cell.

Hello,

I'm building a app via App Designer. The app allows the user to use a numeric keypad to enter a 6-digit passcode and submit that code. I have a file that holds demo data with a person's first name, last name, and their assigned code.

What I want to do is to create a ui message that says "hello, {firstname} {lastname}" when their passcode is entered correctly. I'm trying to use

readtable

to pull the table from the "loginInfo.txt" file, and write code to pull the code's first and last name on its respected row. This is what I have, minus the app design:

function startupFcn(app)
            T = readtable('loginInfo.txt') % printing out for debugging. Thought about creating table to pull firstName
            % and lastName cell/string
            msgbox("Hello, Please Enter Identification Passcode:"); 
end

 % Button pushed function: confirm
        function confirmButtonPushed(app, event)
           codeString = string(app.passCode.Value);
           msgbox(codeString);
           
%            A = fileread("loginInfo.txt") Trying ideas
%            B = strfind(A, codeString);

% if a correct passcode is discovered
           if ~isempty(B)
     
               uialert(uifigure,"Yes",codeString); %My potential "Hello, {firstName} {lastName}" message.
           end
%          assignin("base",'fcnStatus',codeString);           
           

T = readtable output

T =

4×3 table

LastName      FirstName      PassCode 
____________    __________    __________

{'Doe'     }    {'John'  }    4.3222e+05
{'Doe'     }    {'Jane'  }    3.2901e+05
{'Williams'}    {'John'  }    7.1883e+05
{'Smith'   }    {'Taylor'}    5.7162e+05

Answer 1

[Karim]

Hi Terry,

See below for one example on how to do this. This idea is to first use some logic operators to determine if the code is valid or not, and then extracting the user id with the logic information.

T = readtable("https://nl.mathworks.com/matlabcentral/answers/uploaded_files/1186583/loginInfo.txt")

T = 4×3 table
      LastName      FirstName      PassCode 
    ____________    __________    __________

    {'Doe'     }    {'John'  }    4.3222e+05
    {'Doe'     }    {'Jane'  }    3.2901e+05
    {'Williams'}    {'John'  }    7.1883e+05
    {'Smith'   }    {'Taylor'}    5.7162e+05

% asume the user entered 
Code = 329011;

% use logic operators to find the code in the list
CurrentUser = T.PassCode == Code

CurrentUser = 4×1 logical array
   0
   1
   0
   0

if any(CurrentUser)
    % a valid code has been entered, now print the name of the user
    msgbox( "hello "+T.FirstName{CurrentUser}+" "+T.LastName{CurrentUser});
else
    % no valid code was found... break the routine
    msgbox('Code not recognized')
end

[Terry Carney]

for

CurrentUser = T.PassCode == Code

I had to convert T.PassCode to a string

string(T.PassCode)

is there a reason the code runs for you and not for me? Thank you for your help!!

[Terry Carney]

Nevermind, I answered my own question. Thank you again for your help.