MATLAB: Not enough argument input

array

function Td = dew_point(T,RH)

a = 17.27; b = 237.7;

f = (a.*T)/(b+T) + ln(RH/.100); Td = b.*f ./(a – f);

When i try to run the above code it gives an erorr of not enough argument input , My T and RH are both Vectors

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ok this is my other command window were the values of T and RH have been defined, but i still get the same error code

% the dew point T & RH values

T = [20 25 30 35]; RH = (30:10:100);

Td = Dew_point(T,RH);

Not enough input arguments.

Error in Dew_point (line 7)

f = (a.*T)./(b+T) + log(RH/.100); Td = b.*f ./(a - f);

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csv=csvread("IDV60901.95936.csv") ;  % Read csv file. Have a look on readtable 
T= csv(20,:) ;  % temperature 
RH = csv(27,:) ; % RH 
gamma = log(RH/100)+18.678*T./(257.14+T) ; 
Td1 = 257.14*gamma./(18.678-gamma) ;
Td2 = T - (100-RH)/5 ;

MATLAB: Their something wrong with the script need help please

The error message is clear already and contains the required instructions:

 Function definitions in a script must appear at the end of the file.
 Move all statements after the "dewpoint" function definition to before
 the first local function definition.

Did you try this already?

%test case1
T=15
RH=0.4
Td= dewpoint(T, RH)
%test case 2
T=35
RH=0.8
Td= dewpoint(T, RH)
figure
%plot for 25
T=25;
RH=0.1:0.05:0.95;
Td= dewpoint(T, RH);
my_plots(Td, RH);
hold on
%plot for 32F
T=(32-32).*5./9;
Td= dewpoint(T, RH);
my_plots(Td, RH);
hold on
%plot for 77F
T=(77-32).*5./9;
Td= dewpoint(T, RH);
my_plots(Td, RH);
hold on
%plot for 95F
T=(95-32).*5./9;
Td= dewpoint(T, RH);
my_plots(Td, RH);
legend('25 C', '32F', '77F', '95F')
hold off
function Td = dewpoint(T, RH)
  %set the a and b values
  a = 17.27;
  b = 237.7;
    %declare the
    Td= zeros(1, length(RHS));   % PRE-ALLOCATE !!!

    f=zeros(1, length(RHS));     % PRE-ALLOCATE !!!
    for i=1:length(RH)
        %compute f
        f(i) = a.*T./(b + T) + log(RH(i));
        %copute Td
        Td(i) = b.*f(i)./(a-f(i));
    end
  end
%the my_plot function
function p=my_plots(Td, RH)
  %plot and labeling
  plot(Td, RH)
  title('Mutaz alsomali Dew point plot')
  xlabel('Td (F)')
  ylabel('RH(%)')
end

I've simple moved the script part of the file to the top as explained in the message.

By the way: Try to write meaningful comments. "%set the a and b values" is very obvious, but where do the values come from? "%declare the" is not useful and "%the my_plot function" is neither. Comments will save your live as programmer. While an exhaustively commented code can be expanded, maintained and debugged, missing comments leaves code in a status, in which deleting and rewriting is the most reliable option.

Pre-allocation is much more efficient than letting an array grow iteratively.

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MATLAB: Their something wrong with the script need help please

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