Beginner... why a matrix with numbers and strings doesn't give me the numbers? ( I know I have to transform the numbers into strings)

I just would like to know how it works.

e.g

t = 71 ;
c = (t-32)/1.8 ;
hey = ['The temperature is , c , 'C']

1. it's not going to work! I have to use a command to transform "c".why???

a = [ 'how's it going' , 10 , 'cool' ]

it will give me both strings but not the number 10 ....

it looks like there's no "10" in "a" ..

thanks for helping

Answer 1

[Walter Roberson]

a = [ 'how''s it going' , num2str(10) , 'cool' ];

or

a = sprintf('how''s it going %d cool' 10];

or

a =  sprintf('%s %d %s', 'how''s it going', 10, 'cool' ];

[Douglas Alves]

Walter, but how matlab "sees" a number when in an array there are strings and numbers that's what I don't understand. I see that we gotta use num2str.

why the array works as if there's no number in it when u have a mix of strings and numbers in an array?

Thanks for the other ways of doing it I didn't know it.

[Walter Roberson]

Characters are stored internally as non-negative integers, together with a flag indicating to display as characters. For example 33 corresponds to the character '1', 65 corresponds to 'A', 126 corresponds to '~'. When you mix numbers into a character array, the result might the flag saying to display as characters, or the flag might apply to the numbers as well. The number 10 corresponds to the character "newline" so mixing a 10 in with a string can result in a string that has newline at that location.

See also char()

[Douglas Alves]

Thank you very much. That's exactly what I would like to know.