Getting the wrong output value when running the code

Is anyone able to help me locate why my code is showing the wrong answer when it does the equation. I have the code working perfectly as I wanted it to but when running the code I get answers that are not even correct. Any way to fix this?

Thank you.

t_i='';

t_f='';

t_i = input(strcat(t_i, ' Initial Temperature: \n'));

t_f = input(strcat(t_f, ' Final Temperature: \n'));

T=t_i:2:t_f; %Range of temp. from input value

T=T+273.15; %Conversion of celsius to kelvins

fprintf('Pressure\tTemperature\n'); %to print table in command window

for t=1:length(T)

p = b-(a*0.05333/T(t)); %vapor pressure equation

p = 10.0^p;

fprintf('%f\t%f\n',p,T(t));

end

%output

% Pressure Temperature

% 19.517961 273.150000

% 21.823778 275.150000

% 24.362704 277.150000

% 27.154148 279.150000

% 30.218758 281.150000

% 33.578477 283.150000

% 37.256592 285.150000

% 41.277788 287.150000

% 45.668205 289.150000

% 50.455482 291.150000

% 55.668823 293.150000

% 61.339041 295.150000

% 67.498616 297.150000

% 74.181750 299.150000

% 81.424420 301.150000

% 89.264431 303.150000

% 97.741473 305.150000

% 106.897169 307.150000

% 116.775136 309.150000

% 127.421028 311.150000

% 138.882599 313.150000

% 151.209747 315.150000

Answer 1

[Yongjian Feng]

It is a simple function here. This kind of error can be easily found using matlab debugger. Set a break point in the loop, and hand compute the value. Then compare it with what matlab gets.

[Glenti Jalli]

using the debugger it continues to give me the same values as I get when the full code is being run. Is there some sort of inverse function (for Log of 10) built in the system that I can use?

[Yongjian Feng]

I am not very familar with vapor pressure equattion. What are the values of a and b please?

As for the inverse function, are you looking for log10? Try log10(p) for your case.