trouble with code to form robust solver that can handle different unknowns
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aldburg
il 20 Nov 2017
Risposto: Walter Roberson
il 20 Nov 2017
I am trying to write some code that can identify an unknown and solve an equation with respect to it. For example, my input box asks for values for x,y,z, and w. At the moment if I enter values for everything except x it will find a solution for x and prompt the user, but it only works for x. How can I modify my code so it can solve for another variable without explicitly telling it what unknown it will be?
clear
prompt = {'x','y','z','w'};
dlg_title = 'Input';
num_lines = 1;
defaultans = {'...','...','...','...'};
options.Interpreter = 'tex';
answer = inputdlg(prompt,dlg_title,num_lines,defaultans,options)
test_for_numbers=str2double(answer);
if isnan(test_for_numbers)
% str is a "symbol"
else
% num is numeric value
end
syms x
Solution = solve(x+test_for_numbers(2,1)+test_for_numbers(3,1)+test_for_numbers(4,1)== 100, x)
x = Solution
CreateStruct.Interpreter = 'tex';
CreateStruct.WindowStyle = 'modal';
h=msgbox(sprintf('x = %2.3g',x),'x',CreateStruct);
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Walter Roberson
il 20 Nov 2017
You can use symvar() on a character string (even without the Symbolic toolbox.)
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