why can't my 2nd output argument in my function return any value?

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Natalia Wong 2015-12-4

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评论： Star Strider 2015-12-5

quadratic_roots.m

Hi, I 'm trying to create a function that calculates the root from the the quadratic eqn. i need to display the two roots separately but why does my second root, k not appear from the output.argument. thanks i am new to matlab

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Star Strider 2015-12-4

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You have to ask it specifically for as many outputs as you want it to return. By default, if you only ask it for one, it will only return the first. This call returns all of them:

a = 2;
b = 5;
c = 10;
[j,k,group]=quadratic_roots(a,b,c)

Also, I would change:

group='non-equal complex valued roots'

to:

group='complex-conjugate roots'

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Natalia Wong 2015-12-5

编辑：Walter Roberson 2015-12-5

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Thank you so much Star Strider. Since you're so good can you help me with this task? I'm supposed to create a program that prompts the user to guess the colour (5 characters) and tell them how many colours and position that that they guessed are correct and that how many colours only that they guessed are correct. Pls help I'm stuck. If result == hidden_seq gives me 1 0 0 0 0 means that the first colour and first position is correct but how do I tell that to the user since the hidden sequence varies and the user enters a different different seq of colours everytime?

%Written by:
% Student ID:
%ver 01, 8 Dec by JL
clc
clear
% Initiate Random Color Sequence
% r-red; b-blue; y-yellow; g-green; w-white; p-purple; o-orange;
all_colors = 'rbygwpo';
index = randperm(7);
hidden_seq = all_colors(index(1:5));
   count = 0;
while 1
    %Prompting user to enter input
    result = input('Guess the 5 characters colour sequence: ');
    count = count + 1;
      %Validate user input
      if numel(result) > 5 || numel(result) < 5
          error('You have entered more or less than 5 characters')
      end
      %Check the user guesses
     result == hidden_seq 
end