How to add negative number to the and of rand function (2024)

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George Francis on 21 Apr 2016

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Commented: George Francis on 22 Apr 2016

Hello I have to generate 5 lines of random numbers and at the end of random numbers I have to add one extra negative number from (-1 to -9) I tried strcat and things like that but I couldn't combine negative and real numbers can You help me please? The code below will create everything what I need but I have to somehow combine them. Result has to be for example. Then I have to send them via serial port to the arduino. I know how to do it but sometimes it showed me error. It works only when i send it as a string. I had it like this i = input('Pu numbers: ', '%s'), fwrite(s,i); and it works but now I have to send those random numbers

if true

1 2 3 4 5 -1

5 8 3 5 9 -2

.

.

.

9 2 4 8 6 -9

end

if true

% for b = 1:9

x = round(rand(1,5)*9);

disp(x)

end

for a = -1:-1:-9

disp (a);

end

end

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Answers (2)

Roger Stafford on 21 Apr 2016

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Edited: Roger Stafford on 21 Apr 2016

What about

x = [floor(10*rand(1,5)),floor(-9*rand)];

(Note: writing "round(rand(1,5)*9)" makes 0 and 9 half as probable as each of the other integers in between.)

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George Francis on 21 Apr 2016

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I have to do it separatly and then add the negative numbers. Also the negative numbers can't be random. It has to be in order from -1 to -9.

1 2 3 4 5 -1

4 7 8 9 3 -2

. -3

. -4

1 4 7 8 9 -5

etc.

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Renato Agurto on 21 Apr 2016

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Assuming x is your 9x5 random matrix:

out = [x (-1:-1:-9)'];

is this what you want?

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George Francis on 21 Apr 2016

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It shows me error Dimensions of matrices being concatenated are not consistent.

Also then I have to write each line to the serial port separetly, that's why I have there loop for

Renato Agurto on 21 Apr 2016

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yes, but you have 2 separate for loops. Can you give us an example of x... should it be constantly overwritten or is a big matrix?

George Francis on 22 Apr 2016

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I don't know how it supposed to look. I thought that I will make in the firts for loop random numbers from 1 to 9 then in another for loop I'll try add negative numbers in order from -1 to -9 and then I will create another for loop with pause which sends this data into serial port one by another.

1 step

1 2 3 4 5

4 7 8 9 3

.

.

1 4 7 8 9

2 step

1 2 3 4 5 -1

4 7 8 9 3 -2

. -3

. -4

1 4 7 8 9 -5

3 step

for p = 1:9

fwrite(serial object, data x);

pause(5);

end

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How to add negative number to the and of rand function (2024)

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