how to solve this error?

%the equation used to determine the Tfreeze == Ts- A*exp(-k*t)
%By using this equation, the time taken for ice cream to melt can be found.
clear
clc
place = menu ('Please choose place to eat the ice cream:','Outside the store','Inside the store');
switch place
    case 1
        %to calc the time taken for ice cream Double Choc to melt
        syms A k
        Tfreeze =-18; Ts= 32; t=0;
        equli=Tfreeze== Ts- A*exp(-k*t);
        ansk= solve(equli, A);
        A1value =double (ansk);
        
        syms k
        Tfreeze=-9; Ts=32;t=1; A=A1value;
        equlii =Tfreeze==Ts-A*exp(-k*t);
        ansk= solve (equlii,k);
        k1value =double (ansk);
        
        syms t
        Tfreeze=-13.5; Ts=32; k= k1value;
        equliii=Tfreeze == Ts-A*exp(-k*t);
        anst =solve (equliii,t);
        t1value= double(anst);
        
        % to calc the time taken for gelato to melt
        syms A k
        Tfreeze =-23; Ts=32; t=0;
        equli= Tfreeze== Ts-A*exp(-k*t);
        ansk= solve(equli, A);
        A2value= double (ansk);
        
        syms k
        Tfreeze = -13; Ts=32; t= 1; A=A2value;
        equlii=Tfreeze == Ts-A*exp(-k*t);
        ansk= solve(equlii,k);
        k2value = double (ansk);
        
        syms t
        Tfreeze = 15.5; Ts= 32; k=k2value;
        equliii= Tfreeze == Ts-A*exp (-k*t);
        anst= solve(equliii,t);
        t2value=double (anst);
        
        % to cal the time taken for frozen yogurt to melt
        syms A k
        Tfreeze =-20; Ts=32; t=0;
        equ3i= Tfreeze == Ts- A*exp(-k*t);
        ansk= solve(equ3i,A);
        A3value=double(ansk);
        
        syms k
        Tfreeze= -8; Ts=32; t=1; A=A3value;
        equ3ii = Tfreeze == Ts-A*exp(-k*t);
        ansk=solve (equ3i,k);
        k3value= double (ansk);
        
        syms t
        Tfreeze = 23.7; Ts = 25; k=k3value;
        equ3iii = Tfreeze == Ts-A*exp(-k*t);
        anst= solve(equ3iii,t);
        t3value= double(anst);
        
        
        %to calc the time taken for Sorbet to melt
        syms A k
        Tfreeze = -14; Ts=25; t=0;
        equ4i = Tfreeze == Ts-A*exp(-k*t);
        ansk=solve (equ4i,A);
        A4value = double (ansk);
        
        syms k
        Tfreeze =-9; Ts= 25; t=1; A= A4value;
        equ4ii = Tfreeze == Ts- A*exp(-k*t);
        ansk = solve (equ4ii,k);
        k4value = double (ansk);
        
        syms t
        Tfreeze = 15.7; Ts=25; k= k4value;
        equ4iii = Tfreeze == Ts-A*exp(-k*t);
        anst = solve (equ4iii,t);
        t4value = double (anst);
        
        %if customer  want to buy the ice cream
        disp ('Welcome to Anne Ice cream Shop');
        %the greeting from Anne Store to customers
        name = input ('Please Enter your name : ','s');
        disp ('Menu Available Today!!: 1.Ice Cream Double Choc, 2.Gelato, 3.Frozen Yogurt and 4.Sorbet');
        %the menu is displayed
        ice = input ('Please enter the number of ice cream')
        %customer select the menu
        Quantity = input ('Quantity?'); 
        %Quantity that customers want
        
        
        if Ice == 1
            x=5; %Price for ice cream Double Choc
            Price =x*quantity;
            fprintf ('The price for %2.0f ice cream double choc is RM%4.0f\n',quantity, price);
            fprintf ('The time for ice cream to melt is%3.0f minutes \n',t1value);
            idsp('Enjoy your Ice Cream before it melts :');
        elseif Ice == 2
            x=7; %Price for Gelato
            Price = x*quantity;
            fprintf ('The price for %2.0f Gelato is RM%4.0f\n',quantity, Price);
            fprintf('The time for Gelato melt is %3.0f minutes \n',t2value);
            disp('Enjoy your gelato before it melts:)');
        elseif Ice == 3
            x=9; %Price for Frozen Yogurt
            Price = x*quantity;
            fprintf ('The price for %2.0f Frozen Yogurt melt is %3.0f minutes\n',t3value);
            disp ('Enjoy your Frozen Yogurt before it melts :)');
        elseif Ice == 4
            x =10; %Price for Sorbet
            Price =x*quantity;
            fprintf ('The price for %2.0f Sorbet is RM%4.0f\n', quantity, price);
            fprintf ('The time for Sorbet melt is %3.0f minutes \n',t4value);
            disp('Enjoy your Sorbet before it melts :');
        else
            disp ('You find the ice cream you want another shop');
        end 
        
    case 2
        % To calc the time for Ice Cream Double Choc
        syms A k
        Tfreeze =-18; Ts=25 ; t=0;
        equli = Tfreeze == Ts-A*exp(-k*t);
        ansk = solve (equli, A);
        A1value = double (ansk);
        
        syms k
        Tfreeze =-9; Ts=25; t=1; A= A1value;
        equlii= Tfreeze == Ts-A*exp (-k*t);
        ansk = solve (equlii, k);
        k1value = double (ansk);
        
        syms t
        Tfreeze = 13.5; Ts=25; k=k1value;
        equliii= Tfreeze == Ts-A*exp(-k*t);
        anst = solve (equliii,t);
        t1value = double(anst);
        
        % To calc the time for Gelato
        syms A k
        Tfreeze =-23; Ts=25; t=0;
        equli=Tfreeze ==Ts- A*exp(-k*t);
        ansk = solve (equli,A);
        A2value =double (ansk);
        
        syms k
        Tfreeze=-13; Ts=25; t=1; A=A2value;
        equlii= Tfreeze == Ts-A*exp(-k*t);
        ansk =solve (equlii,k)
        k2value = double (ansk);
        
        syms t
        Tfreeze =15.5; Ts=25; k= k2value;
        equliii =Tfreeze == Ts-A*exp (-k*t);
        anst= solve (equliii,t);
        t2value = double (anst);
        
        %To calc the time for Frozen Yogurt
        syms A k
        Tfreeze =-20; Ts=25; t=0;
        equ3i = Tfreeze == Ts-A*exp(-k*t);
        ansk =solve (equ3i,A);
        A3value = double (ansk);
        
        syms k
        Tfreeze =-8; Ts=25 ; t=1; A=A3value;
        equ3ii = Tfreeze == Ts-A*exp(-k*t);
        ansk = solve (equ3ii,k);
        k3value= double (ansk);
        
        syms t
        Tfreeze= 23.7; Ts=25; k= k3value;
        equ3iii =Tfreeze == Ts-A*exp(-k*t);
        anst = solve(equ3iii,t);
        t3value= double (anst);
        
        %To calc the time taken for Sorbet 
        syms A k
        Tfreeze = -14; Ts=25; t=0;
        equ4i= Tfreeze== Ts-A*exp(-k*t);
        ansk= solve(equ4i,A);
        A4value = double (ansk);
        
        syms k
        Tfreeze =-9; Ts=25; t=1; A=A4value;
        equ4ii =Tfreeze== Ts-A*exp(-k*t);
        ansk = solve(equ4ii,k);
        k4value =double (ansk);
        
        sym t
        Tfreeze =15.7; Ts=25; k=k4value;
        equ4iii= Tfreeze== Ts-A*(-k*t);
        anst= solve(equ4iii,t);
        t4value=double (anst);
end

%if customer  want to buy the ice cream
disp ('Welcome to Anne Ice cream Shop');
%the greeting from Anne Store to customers
name= input ('Please Enter your name : ','s');
disp ('Menu Available Today!!: 1.Ice Cream Double Choc, 2.Gelato, 3.Frozen Yogurt and 4.Sorbet');
%the menu is displayed
ice = input ('Please enter the number of ice cream');
%customer select the menu
Quantity = input ('Quantity?'); 
%Quantity that customers want


if Ice == 1
    x=5; %Price for ice cream Double Choc
    Price =x*quantity;
    fprintf ('The price for %2.0f ice cream double choc is RM%4.0f\n',quantity, price);
    fprintf ('The time for ice cream to melt is%3.0f minutes \n',t1value);
    idsp('Enjoy your Ice Cream before it melts :');
elseif Ice == 2
    x=7; %Price for Gelato
    Price = x*quantity;
    fprintf ('The price for %2.0f Gelato is RM%4.0f\n',quantity, Price);
    fprintf('The time for Gelato melt is %3.0f minutes \n',t2value);
    disp('Enjoy your gelato before it melts:)');
elseif Ice == 3
    x=9; %Price for Frozen Yogurt
    Price = x*quantity;
    fprintf ('The price for %2.0f Frozen Yogurt melt is %3.0f minutes\n',t3value);
    disp ('Enjoy your Frozen Yogurt before it melts :)');
elseif Ice == 4
    x =10; %Price for Sorbet
    Price =x*quantity;
    fprintf ('The price for %2.0f Sorbet is RM%4.0f\n', quantity, price);
    fprintf ('The time for Sorbet melt is %3.0f minutes \n',t4value);
    disp('Enjoy your Sorbet before it melts :');
else
    disp ('You find the ice cream you want another shop');
end 

[Luca Ferro]

Could you specify to which error are you referring to?

[Walter Roberson]

idsp('Enjoy your Ice Cream before it melts :');

You misspelled disp()

[siti nurhidayah]

i dont know why my matlab cannot run. it shows at the command window 'Illegal use of reserved keyword "case"'. do you know how to slove it ?

[siti nurhidayah]

the command window show that "Illegal use of reserved keyword "case"". can someone explain ?? TT

[Rik]

How exactly are you attempting to run this code?

(note that flags are meant to attract the attention of site admins, not to post comments)

Answer 1

[Sulaymon Eshkabilov]

Here is completely fixed code. There were several errors with inconsistent variable names, setting and solving symbolic equations and misspelled MATLAB fcn names (idsp vs. disp), e.g.: ice vs. Ice, Quantity vs. quantity, etc.

%the equation used to determine the Tfreeze == Ts- A*exp(-k*t)
%By using this equation, the time taken for ice cream to melt can be found.
clear
clc
place = menu ('Please choose place to eat the ice cream:','Outside the store','Inside the store');
switch place
    case 1
        %to calc the time taken for ice cream Double Choc to melt
        syms A k
        Tfreeze =-18; Ts= 32; t=0;
        equli=Tfreeze== Ts- A*exp(-k*t);
        ansk= solve(equli, A);
        A1value =double (ansk);
        
        syms k
        Tfreeze=-9; Ts=32;t=1; A=A1value;
        equlii =Tfreeze==Ts-A*exp(-k*t);
        ansk= solve (equlii,k);
        k1value =double (ansk);
        
        syms t
        Tfreeze=-13.5; Ts=32; k= k1value;
        equliii=Tfreeze == Ts-A*exp(-k*t);
        anst =solve (equliii,t);
        t1value= double(anst);
        
        % to calc the time taken for gelato to melt
        syms A k
        Tfreeze =-23; Ts=32; t=0;
        equli= Tfreeze== Ts-A*exp(-k*t);
        ansk= solve(equli, A);
        A2value= double (ansk);
        
        syms k
        Tfreeze = -13; Ts=32; t= 1; A=A2value;
        equlii=Tfreeze == Ts-A*exp(-k*t);
        ansk= solve(equlii,k);
        k2value = double (ansk);
        
        syms t
        Tfreeze = 15.5; Ts= 32; k=k2value;
        equliii= Tfreeze == Ts-A*exp (-k*t);
        anst= solve(equliii,t);
        t2value=double (anst);
        
        % to cal the time taken for frozen yogurt to melt
        syms A k
        Tfreeze =-20; Ts=32; t=0;
        equ3i= Tfreeze == Ts- A*exp(-k*t);
        ansk= solve(equ3i,A);
        A3value=double(ansk);
        
        syms k
        Tfreeze= -8; Ts=32; t=1; A=A3value;
        equ3ii = Tfreeze == Ts-A*exp(-k*t);
        ansk=solve (equ3ii,k);
        k3value= double (ansk);
        
        syms t
        Tfreeze = 23.7; Ts = 25; k=k3value; 
        equ3iii = Tfreeze == Ts-A*exp(-k*t);
        anst= solve(equ3iii,t);
        t3value= double(anst);
        
        
        %to calc the time taken for Sorbet to melt
        syms A k
        Tfreeze = -14; Ts=25; t=0;
        equ4i = Tfreeze == Ts-A*exp(-k*t);
        ansk=solve (equ4i,A);
        A4value = double(ansk);
        
        syms k
        Tfreeze =-9; Ts= 25; t=1; A= A4value;
        equ4ii = Tfreeze == Ts- A*exp(-k*t);
        ansk = solve (equ4ii,k);
        k4value = double(ansk);
        
        syms t
        Tfreeze = 15.7; Ts=25; k= k4value;
        equ4iii = Tfreeze == Ts-A*exp(-k*t);
        anst = solve (equ4iii,t);
        t4value = double(anst);
        
        %if customer  want to buy the ice cream
        disp ('Welcome to Anne Ice cream Shop');
        %the greeting from Anne Store to customers
        name = input ('Please Enter your name:    ','s');
        disp ('Menu Available Today!!: 1.Ice Cream Double Choc, 2.Gelato, 3.Frozen Yogurt and 4.Sorbet');
        %the menu is displayed
        Ice = input ('Please enter the number of ice cream:   ');
        %customer select the menu
        Quantity = input ('Quantity?   '); 
        %Quantity that customers want
        
        
        if Ice == 1
            x=5; %Price for ice cream Double Choc
            Price =x*quantity;
            fprintf ('The price for %2.0f ice cream double choc is RM%4.0f\n',quantity, price);
            fprintf ('The time for ice cream to melt is%3.0f minutes \n',t1value);
            idsp('Enjoy your Ice Cream before it melts :');
        elseif Ice == 2
            x=7; %Price for Gelato
            Price = x*quantity;
            fprintf ('The price for %2.0f Gelato is RM%4.0f\n',quantity, Price);
            fprintf('The time for Gelato melt is %3.0f minutes \n',t2value);
            disp('Enjoy your gelato before it melts:)');
        elseif Ice == 3
            x=9; %Price for Frozen Yogurt
            Price = x*quantity;
            fprintf ('The price for %2.0f Frozen Yogurt melt is %3.0f minutes\n',t3value);
            disp ('Enjoy your Frozen Yogurt before it melts :)');
        elseif Ice == 4
            x =10; %Price for Sorbet
            Price =x*quantity;
            fprintf ('The price for %2.0f Sorbet is RM%4.0f\n', quantity, price);
            fprintf ('The time for Sorbet melt is %3.0f minutes \n',t4value);
            disp('Enjoy your Sorbet before it melts :');
        else
            disp ('You find the ice cream you want another shop');
        end 
        
    case 2
        % To calc the time for Ice Cream Double Choc
        syms A k
        Tfreeze =-18; Ts=25 ; t=0;
        equli = Tfreeze == Ts-A*exp(-k*t);
        ansk = solve (equli, A);
        A1value = double (ansk);
        
        syms k
        Tfreeze =-9; Ts=25; t=1; A= A1value;
        equlii= Tfreeze == Ts-A*exp (-k*t);
        ansk = solve (equlii, k);
        k1value = double (ansk);
        
        syms t
        Tfreeze = 13.5; Ts=25; k=k1value;
        equliii= Tfreeze == Ts-A*exp(-k*t);
        anst = solve (equliii,t);
        t1value = double(anst);
        
        % To calc the time for Gelato
        syms A k
        Tfreeze =-23; Ts=25; t=0;
        equli=Tfreeze ==Ts- A*exp(-k*t);
        ansk = solve (equli,A);
        A2value =double (ansk);
        
        syms k
        Tfreeze=-13; Ts=25; t=1; A=A2value;
        equlii= Tfreeze == Ts-A*exp(-k*t);
        ansk =solve (equlii,k)
        k2value = double (ansk);
        
        syms t
        Tfreeze =15.5; Ts=25; k= k2value;
        equliii =Tfreeze == Ts-A*exp (-k*t);
        anst= solve (equliii,t);
        t2value = double (anst);
        
        %To calc the time for Frozen Yogurt
        syms A k
        Tfreeze =-20; Ts=25; t=0;
        equ3i = Tfreeze == Ts-A*exp(-k*t);
        ansk =solve (equ3i,A);
        A3value = double (ansk);
        
        syms k
        Tfreeze =-8; Ts=25 ; t=1; A=A3value;
        equ3ii = Tfreeze == Ts-A*exp(-k*t);
        ansk = solve (equ3ii,k);
        k3value= double (ansk);
        
        syms t
        Tfreeze= 23.7; Ts=25; k= k3value;
        equ3iii =Tfreeze == Ts-A*exp(-k*t);
        anst = solve(equ3iii,t);
        t3value= double (anst);
        
        %To calc the time taken for Sorbet 
        syms A k
        Tfreeze = -14; Ts=25; t=0;
        equ4i= Tfreeze== Ts-A*exp(-k*t);
        ansk= solve(equ4i,A);
        A4value = double (ansk);
        
        syms k
        Tfreeze =-9; Ts=25; t=1; A=A4value;
        equ4ii =Tfreeze== Ts-A*exp(-k*t);
        ansk = solve(equ4ii,k);
        k4value =double (ansk);
        
        syms t
        Tfreeze =15.7; Ts=25; k=k4value; A=A4value;
        equ4iii= Tfreeze== Ts-A*(-k*t);
        anst= solve(equ4iii,t);
        t4value=double (anst);
end

%if customer  want to buy the ice cream
disp ('Welcome to Anne Ice cream Shop');
%the greeting from Anne Store to customers
name= input ('Please Enter your name :   ','s');
disp ('Menu Available Today!!: 1.Ice Cream Double Choc, 2.Gelato, 3.Frozen Yogurt and 4.Sorbet');
%the menu is displayed
Ice = input ('Please enter the number of ice cream:   ');
%customer select the menu
quantity = input ('Quantity?    '); 
%Quantity that customers want


if Ice == 1
    x=5; %Price for ice cream Double Choc
    Price =x*quantity;
    fprintf ('The price for %2.0f ice cream double choc is RM%4.0f\n',quantity, Price);
    fprintf ('The time for ice cream to melt is%3.0f minutes \n',t1value);
    disp('Enjoy your Ice Cream before it melts :');
elseif Ice == 2
    x=7; %Price for Gelato
    Price = x*quantity;
    fprintf ('The price for %2.0f Gelato is RM%4.0f\n',quantity, Price);
    fprintf('The time for Gelato melt is %3.0f minutes \n',t2value);
    disp('Enjoy your gelato before it melts:)');
elseif Ice == 3
    x=9; %Price for Frozen Yogurt
    Price = x*quantity;
    fprintf ('The price for %2.0f Frozen Yogurt melt is %3.0f minutes\n',t3value);
    disp ('Enjoy your Frozen Yogurt before it melts :)');
elseif Ice == 4
    x =10; %Price for Sorbet
    Price =x*quantity;
    fprintf ('The price for %2.0f Sorbet is RM%4.0f\n', quantity, Price);
    fprintf ('The time for Sorbet melt is %3.0f minutes \n',t4value);
    disp('Enjoy your Sorbet before it melts :');
else
    disp ('You find the ice cream you want another shop');
end