REPEATING COMMAND BY FUNCTION

A small code has been created to check the a sensor's input variable value as per its scaling values. The code runs like this:

clear all;
clc;

sval=0;

p1='Please enter Minimum Range of Sensor Input : ';
smin=input(p1);
p2='Please enter Maximum Range of Sensor Input : ';
smax=input(p2);
p3='Please enter Minimum Range of Sensor Output : ';
inmin=input(p3);
p4='Please enter Maximum Range of Sensor Output : ';
inmax=input(p4);

rate=(smax-smin)/(inmax-inmin);
offset=smin-(inmin*rate);

show=['Your Scaling Rate will be : ',num2str(rate)];
disp(show)
show1=['Your Offset will be : ',num2str(offset)];
disp(show1)

p5='Do you want to calculate now [Y/N] :  ';
str=input(p5,'s');

if str=='y' || str=='Y'
    p6='Please enter output value of sensor : ';
    inpt=input(p6);
    if inpt<inmin || inpt>inmax
        sprintf('Input value out of range')
    else
    sval=(inpt*rate)+offset;
    show2=['Value input at sensor is : ',num2str(sval)];
    disp(show2)
    end
end

Now, after displaying the present values, we need to go back to the part where we ask the user whether they want to calculate now. In C++, we generally used the "GOTO" command for this. But we guess it is not available in Matlab. Also, when we tried to create a function, an error is shown as:

function recap 
p5='Do you want to calculate now [Y/N] :  ';
str=input(p5,'s');

"FUNCTION keyword use is invalid here. This might cause later messages about END. "

Please suggest some solution!!

Answer 1

[Jan]

You should not use GOTO in any code, because it is massively unclear. Use a loop instead:

while true
    p1='Please enter Minimum Range of Sensor Input : ';
    smin=input(p1);
    if isempty(smin)
        break;  % Break out of the WHILE loop
    end
    ...
end

In modern Matlab versions a function can be created in a script also. In older versions (as far as I remember <= R2016a), functions can be defined in other function files only. Then some patterns must be considered:

function Outputs = main(Inputs)
...
end   % <= If one function has a closing END, all functions need it

function Out = SubFunction(Ins)

end

Closing end statements are needed also, if nested functions are used.

[Aditya Chakravarty]

Thank you very much for the answer!! We did use the while loop as :

p5='Do you want to calculate now [Y/N] :  ';
str=input(p5,'s');

while str=='y' || str=='Y'
    p6='Please enter output value of sensor : ';
    inpt=input(p6);
    if inpt<inmin || inpt>inmax
        sprintf('Input value out of range')
    else
    sval=(inpt*rate)+offset;
    show2=['Value input at sensor is : ',num2str(sval)];
    disp(show2)
    end
end

This did help us bit, as in, if we give option 'Y' in string input 'p5', then, after giving value of 'show2', it again starts asking for variable 'p6'.

But our doubt is that we need to ask the user whether want to calculate again or not, that is, after displaying value of 'show2', the program should run from 'p5'.

Please check and suggest.

[Jan]

p5  = 'Do you want to calculate now [Y/N] :  ';
str = input(p5, 's');
while strcmpi(str, 'y')
    p6   = 'Please enter output value of sensor : ';
    inpt = input(p6);
    if inpt<inmin || inpt>inmax
        sprintf('Input value out of range')
    else
    sval  = (inpt*rate) + offset;
    show2 = ['Value input at sensor is : ',num2str(sval)];
    disp(show2)
    
    % Ask for the next calculation again:
    str = input(p5, 's');
end

[Aditya Chakravarty]

Thank you very much!! Our issue is resolved.