MATLAB: User Defined Legend Input

legend

How do I display my input (tC1, tC2) in the legend? I want the numerical value of whatever input is used, not the name tC1,tC2. This is my script

tC1=input('Enter the first temperature in °C:');
tC2=input('Enter the second temperature in °C:');
tK1=(tC1)+(273.15);
tK2=(tC2)+(273.15);
n=1;
R=8.314;
v=0:1:1000;
pkPa1=(n*R*tK1)./v;
pkPa2=(n*R*tK2)./v;
semilogx(v,pkPa1)
ylim([0 1000])
hold on;
semilogx(v,pkPa2,'--r')
ylim([0 1000])
grid on;
title('Title');
xlabel('Volume');
ylabel('Pressure');
legend(tC1,tC2);<----This is where my problem is

Best Answer

legend( num2str(tC1), num2str(tC2) )

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Rearrange as lnP = A - B/T --> -B/T + A which has form of mx+b for x=1/T, m=-B, b=A.

>> b=polyfit(1./tk,log(pkpa),1);  % fit the form
>> yhat=polyval(b,1./tk);         % evaluate in Matlab form
>> plot(tk,pkpa,'*-')             % plot raw data
>> hold all
>> plot(tk,exp(yhat),'r-')        % add fit
>> B=-b(1);                       % convert to you nomenclature
>> A=b(2);
>> polyval([-B A],1/tk(1))==yhat(1)         % compare results to show same
ans =
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>>

NB: Remember must take exp to convert to actual units of P since fitted ln(P)

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Insuficient info;

HOW LONG IS ONE DELAY ...

1 second? 1 minute? 1 hour? 1 day?...

although you can recursively predict multiple delays ahead, errors will accumulate and the predictions become meaningless.

There is no magic formula that specifies how many multiples of the maximum delay can be used for predictions before errors accumulate to overwhelm accuracy.

Hope this helps

Thank you for formally accepting my answer

Greg

Best Answer

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MATLAB: How to find the coefficients for an equation having the experimental data

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