How do I put variable values into a text string in MATLAB

Question

I m trying to write a simple function that takes two inputs  x and y  and passes these to three other simple functions that add  multiply  and divide them  The main function should then display the results as a string containing x  y  and the totals   I think there s something I m not understanding about output arguments  Anyway  here s my  pitiful  code   function a addxy x y  a x y   function b mxy x y  b x y   function c dxy x y  c x y    The main function is   function  d e f  answer x y  d addxy x y   e mxy x y   f dxy x y   z  d e f    How do I get the values for x  y  d  e  and f into a string  I tried different matrices and stuff like     the sum of  x  and  y  is  d    but none of the variables are showing up   Two additional issues    Why is the function returning  ans 3  even though I didn t ask for the length of z  If anyone could recommend a good book for beginners to MATLAB scripting I d really appreciate it

User · Answer

I was looking for something along what you wanted, but wanted to put it back into a variable.

So this is what I did

variable = ['hello this is x' x ', this is now y' y ', finally this is d:' d]

basically

variable = [str1 str2 str3 str4 str5 str6]

User · Answer

I just realized why I was having so much trouble - in MATLAB you can t store strings of different lengths as an array using square brackets  Using square brackets concatenates strings of varying lengths into a single character array        gt  gt  a   matlab   is   fun    a    matlabisfun   gt  gt  size a   ans         1    11   In a character array  each character in a string counts as one element  which explains why the size of a is 1X11   To store strings of varying lengths as elements of an array  you need to use curly braces to save as a cell array  In cell arrays  each string is treated as a separate element  regardless of length    gt  gt  a   matlab   is   fun    a          matlab      is      fun    gt  gt  size a   ans         1     3

User · Answer

As Peter and Amro illustrate  you have to convert numeric values to formatted strings first in order to display them or concatenate them with other character strings  You can do this using the functions FPRINTF  SPRINTF  NUM2STR  and INT2STR     With respect to getting ans   3 as an output  it is probably because you are not assigning the output from answer to a variable  If you want to get all of the output values  you will have to call answer in the following way    out1 out2 out3    answer 1 2     This will place the value d in out1  the value e in out2  and the value f in out3  When you do the following   answer 1 2    MATLAB will automatically assign the first output d  which has the value 3 in this case  to the default workspace variable ans     With respect to suggesting a good resource for learning MATLAB  you shouldn t underestimate the value of the MATLAB documentation  I ve learned most of what I know on my own using it  You can access it online  or within your copy of MATLAB using the functions DOC  HELP  or HELPWIN

User · Answer

You can use fprintf sprintf with familiar C syntax  Maybe something like   fprintf  x    d  y    d  n x y  d  n x y  d  n x y  f n   x y d e f      reading your comment  this is how you use your functions from the main program   x   2  y   2   d e f    answer x y   fprintf   d    d    d n   x y d  fprintf   d    d    d n   x y e  fprintf   d    d    f n   x y f    Also for the answer   function  you can assign the output values to a vector instead of three distinct variables   function result answer x y  result 1  addxy x y   result 2  mxy x y   result 3  dxy x y     and call it simply as   out   answer x y

User · Answer

Here s how you convert numbers to strings  and join strings to other things  it s weird     gt  gt    the number is   num2str 15       ans   the number is 15

[string] How do I put variable values into a text string in MATLAB?

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