I keep getting ??? Error using ==> plus Matrix dimensions must agree. Error in ==> dewpoint at 6 f(T,RH)=((a*T)./(b+T))+log(RH/100)
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T=[20 25 30 35];
RH=30:10:100; %relative humidity percentages
[Td] = dewpoint(T,RH)
the function file is...
function [Td] = dewpoint(T,RH)
%dewpoint at varius temps and humidities
% Detailed explanation goes here
a=17.27;
b=237.7; % Celcius
f(T,RH)=((a*T)./(b+T))+log(RH/100);
Td=(b*f(T,RH))/(a-f(T,RH));
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답변 (2개)
Jacob Ward
2017년 10월 11일
Your T has 4 elements (1x4) while your RH has 8 (1x8). When you try to add them together in your function, MATLAB doesn't know how to add these two matrices because they are not the same size.
Try changing the line defining RH to RH = 30:20:90 so that it has 4 elements like T and your problem should go away.
Walter Roberson
2017년 10월 11일
Vectorize.
function [Td] = dewpoint(T,RH)
%dewpoint at varius temps and humidities
% Detailed explanation goes here
a = 17.27;
b = 237.7; % Celcius
[gT, gRH] = ndgrid(T, RH);
f = ((a*gT)./(b+gT))+log(gRH/100);
Td = (b*f) ./ (a-f);
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