I got this error: Error 1: Cannot implicitly convert type 'double[][]' to 'double[]'

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I got this code:

double[][] ou = new double[h][w];

for(i=0;i<h;i++)
   for(int j=0;j<w;j++)
      ou[i][j] = sortie[z++];

return ou;

And I get this 2 errors:

Error 1: Cannot implicitly convert type 'double[][]' to 'double[]'

referred to "return ou"

Error 2: Invalid rank specifier: expected ',' or ']'

referred to "double[][] ou = new double[h][w];"

EDIT:

I solved Error 1, my function was double[][] myFunction(...)

Posted 22-Jan-11 18:35pm

bosco_boom

Updated 22-Jan-11 18:47pm

v2

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Rod Kemp · Answer 1 · 2011-01-22T19:00:00

Solution 1

Have a read through Arrays Tutorial (C#)[^] on MSDN.

Just as a hint, you have a jagged array in your code which is an array of arrays but I think what you are after is a multi-dimensional array.

Posted 22-Jan-11 19:00pm

Rod Kemp

Updated 22-Jan-11 19:06pm

v2

Comments

Sergey Alexandrovich Kryukov 23-Jan-11 22:50pm

Good minimalistic manual - my 5 (and who cares it's 2003?)

Rod Kemp 23-Jan-11 22:59pm

Thankfully the basics don't change, unfortunately it seems that some people don't know the basics.

Sergey Alexandrovich Kryukov 24-Jan-11 9:57am

I would say don't want to know basics...
Thank you.
--SA

Sergey Alexandrovich Kryukov · Answer 2 · 2011-01-23T16:43:00

Most likely, what you want to do is this:

C#

int h = 3; int w = 4; 
double[,] ou = new double[h, w];

Do you see the difference?

What you tried to write could make sense if you do this:

C#

double[][] ou = new double[h][];

//now you have an array of h arrays of <code>double</code>,
//but each array of <code>double</code> is <code>null</code>;
//you can initialize each array of <code>double</code> separately (in loop for example);
//but let's look at couple of several elements:
ou[0] = new double[w];
uo[1] = new double [200];
uo[1] = new double [w * 2];

This way, each inner array of double can have different length, hence "jagged array".

Now, you can learn what Rod suggested but... why not simply reading C# manual (for example, from Microsoft help)?