display symbols between numbers from a vector

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I'm writing a code to help people on mental computation. To do so, I want to display a sum with the symbol "+" between two numbers located in a vector.
I know it should be simple but I did not succeed so far. Here is an example:
I want to display on command window:
>> 10 + 11
The values 10 and 11 are located in a vector such as:
calc=[10 11];
I tried to do the following code but it doesn't work:
sum_1= [calc(1)," + ", calc(2)];
Can you help me please. Thank you very much.
  1 Comment
darova on 18 Oct 2019
You should convert number into string
Use num2str

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Accepted Answer

Ted Shultz
Ted Shultz on 18 Oct 2019
you can use fprintf to print just about anything you want.
calc=[10 11];
fprintf('%i + %i\n', calc(1), calc(2))
Vincent TORRELLI on 18 Oct 2019
Awesome, that's perfectly working.
Thank you very much !

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More Answers (2)

Steven Lord
Steven Lord on 18 Oct 2019
Since you're using double quotes to create a string, turn your numeric vector into a string array then join the elements of that string array together.
calc = [10 11]
S = string(calc)
sum_1 = join(S, " + ")
You could do this in one line if you don't want to name the string temporary variable.
calc = [10 11]
sum_1 = join(string(calc), " + ")
Alternately if your calc vector is longer and you want to add different symbols you can use + to concatenate the string and numeric data together.
calc = 10:12;
sum1 = calc(1) + " + " + calc(2) + " * " + calc(3)
If this needs to run on an older release of MATLAB that doesn't support string, you can use sprintf.
calc = [10 11]
sum_1 = sprintf('%d + %d', calc)

Vincent TORRELLI on 18 Oct 2019
Thank you every body for your answers.
Steven Lord, your following answer fits very well with my problem:
calc = [10 11]
S = string(calc)
sum_1 = join(S, " + ")
Indeed, the calc vector is parameterized so that its size can vary from 1 to n.
The calc vector contains "n" random numbers that can be either positive and negative.
The final goal will be to not print a "+" sign if the number is negative:
what I don't want: -15 + -16 + 13
what I want: -15 -16 +13
Do you know how to do it?
Thank you in advance.


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