# display symbols between numbers from a vector

3 visualizzazioni (ultimi 30 giorni)
Vincent TORRELLI il 18 Ott 2019
Commentato: Vincent TORRELLI il 18 Ott 2019
Hello,
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)];
disp(sum_1);
Can you help me please. Thank you very much.
Vincent
##### 1 CommentoMostra -1 commenti meno recentiNascondi -1 commenti meno recenti
darova il 18 Ott 2019
You should convert number into string
Use num2str

Accedi per commentare.

### Risposta accettata

Ted Shultz il 18 Ott 2019
you can use fprintf to print just about anything you want.
calc=[10 11];
fprintf('%i + %i\n', calc(1), calc(2))
##### 4 CommentiMostra 2 commenti meno recentiNascondi 2 commenti meno recenti
Ted Shultz il 18 Ott 2019
If you want spaces, you may want to just build up the line element by element. One way to do this would be:
a=[ 1 3 -4 5 -10];
workingString = sprintf('%i ',a(1));
for ii = 2:numel(a)
if a(ii) >= 0
thisSymbol = '+';
else
thisSymbol = '-';
end
workingString = [workingString sprintf('%s %i ',thisSymbol , abs(a(ii) ))]; %#ok<AGROW>
end
workingString = [workingString newline];
disp(workingString)
this gives:
1 + 3 - 4 + 5 - 10
Vincent TORRELLI il 18 Ott 2019
Awesome, that's perfectly working.
Thank you very much !
Vincent

Accedi per commentare.

### Più risposte (2)

Steven Lord il 18 Ott 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)
##### 0 CommentiMostra -2 commenti meno recentiNascondi -2 commenti meno recenti

Accedi per commentare.

Vincent TORRELLI il 18 Ott 2019
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?
Vincent
##### 0 CommentiMostra -2 commenti meno recentiNascondi -2 commenti meno recenti

Accedi per commentare.

### Categorie

Scopri di più su Characters and Strings in Help Center e File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by