Try this:
% Set up the dialog box parameters
prompt = {'Enter temperature:','Enter the temperature scale:'};
dialogTitle = 'Enter parameters';
numberOfLines = 1;
defaultAnswers = {'100','C'};
userResponse = inputdlg(prompt, dialogTitle, numberOfLines, defaultAnswers);
% Extract out individual variables from the user response.
temperature = str2double(userResponse{1})
EoSI = upper(userResponse{2})
TempC = zeros(100,1);
TempK = zeros(100,1);
TempR = zeros(100,1);
TempF = zeros(100,1);
I = 1; % Some index.
if strfind(EoSI, 'C') > 0
TempC(I) = temperature
elseif strfind(EoSI, 'K') > 0
TempK(I) = temperature + 273
elseif strfind(EoSI, 'F') > 0
TempF(I) = temperature * (9/5) + 32
elseif strfind(EoSI, 'R') > 0
TempR(I) = TempK(I)
end
