array of pointers to mutidimensional arrays?

[bigE]

I am trying to create an array of pointers to a set of two-dimensional arrays but cannot seem to get the thing working. Here's the function, which gets called six times. <br><br>void displacement_from_source(int X, int u_position[4][2],int* rx_displacement[6])<br>{<br> <br>int i,j;<br>int* rx;<br>rx=(int*)malloc(8*sizeof(int));<br>rx_displacement[X]=rx;<br><br> for (i=0;i&lt;4;i++)<br> {<br> for (j=0;j&lt;2;j++)<br> {<br> rx<i>[j]=u_position<i>[j];<br> printf(&quot;rx = %d,u= %d\n&quot;, rx<i>[j],u_position<i>[j]);<br> //printf(&quot;rx_displacement[X]=%d\n&quot;,rx_displacement[X]);<br> }<br> }<br>}<br><br>When I run this for a one dimensional array I have no problem. Obviously I am doing something stupid with the pointers to the two-dimensional arrays. I have tried all sorts of things but no luck. I would really appreciate some help. Thanks.<br><br>Ian (BigE)

 

[bbhaskar]

Hi ,<br>&nbsp;&nbsp;First you tell the background of the function which you have written. What it should do and what should be&nbsp;&nbsp;the passed parameters. <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bhaskar <p>Bhaskar Bora<br><a href=mailto:bhaskar_bora@yahoo.com>bhaskar_bora@yahoo.com</a><br><a href= > </a><br>___________________________________________________________<br>
C and C++ are too Cool ... Like CoSSAP ..<br>
Ooops What's this CoSSAP...?? <br>
It's a Objected oriented language created by me ...<br>

 

[bbhaskar]

hi , <br>&nbsp;&nbsp;&nbsp;Here is the code which will surely help you ... <br>&nbsp;&nbsp;&nbsp;You have made many mistakes .. like you have use 'memcpy' for assigning memory , in-fact&nbsp;&nbsp;it is use to copy a memory block.<br>&nbsp;&nbsp;&nbsp;If you still have any problem then you are welcome.<br><br>#include &lt;stdio.h&gt; <br>#include &lt;stdlib.h&gt;<br>#include &lt;string.h&gt;<br><br>void displacement_from_source(int X, int u_position[4][2],int* rx_displacement[6]);<br>void print_out_arrays(int X, int* rx_displacement[6]);<br><br>// Main Program<br>void main ()<br>{<br><br>/* these are not global variables */<br><br>int i,j;<br>int u_position[4][2]={5,6,7,8,9,10,11,12};<br>int X;<br>int* rx_displacement[6]; //array of pointers<br>int*tx; <br>int temp_array[4][2];<br><br>for (X=0; X&lt;6; X++) // go through six times to form the six integer arrays<br>{<br>displacement_from_source(X,u_position,rx_displacement);<br>}<br><br>for (X=0; X&lt;6; X++) //go through six times to print arrays<br>{<br>tx=rx_displacement[X]; //assign pointer tx the first interarray address<br>memcpy(temp_array,tx, 8*sizeof(int)); //assign this address to temp_array<br><br>for (i=0;i&lt;4;i++)<br>{<br>for (j=0;j&lt;2;j++)<br>{ <br>printf(&quot;%d\n&quot;, temp_array[j]);<br>}<br>}<br>}<br><br>}<br><br>void displacement_from_source(int X, int u_position[4][2],int* rx_displacement[6])<br>{<br><br>int i,j;<br><br>int rx_array[4][2];<br>int rx_temp[4][2];<br>int* rx;<br>int* tx;<br>&nbsp;<br>memcpy(rx,rx_temp, 8*sizeof(int)); //assign the address of rx_temp to the pointer rx<br>rx_displacement[X]=rx; //assign the address of rx to the array of pointer's Xth<br>for (i=0;i&lt;4;i++)<br>{<br>for (j=0;j&lt;2;j++)<br>{<br>rx_temp[j]=u_position[j]; <br>}<br>}<br>}<br><br><br> <p>Bhaskar Bora<br><a href=mailto:bhaskar_bora@yahoo.com>bhaskar_bora@yahoo.com</a><br><a href= > </a><br>___________________________________________________________<br>
C and C++ are too Cool ... Like CoSSAP ..<br>
Ooops What's this CoSSAP...?? <br>
It's a Objected oriented language created by me ...<br>

 

[jrcm]

void displacement_from_source(int X, int u_position[4][2],int*[RED]*[/RED] rx_displacement[6])<br>{ int i,j,k=0,int [RED]**arr=*[/RED]rx_displacement;<br>&nbsp;&nbsp;for (i=0;i&lt;4;i++)<br>&nbsp;&nbsp;{ for (j=0;j&lt;2;j++,k++)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(k=X)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ arr[k]=&u_position<i>[j];<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf(&quot;rx_displacement[%d]=%d\n&quot;,X,rx_displacement[k]);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;}<br>}<br>

 

[jrcm]

void displacement_from_source(int X, int u_position[4][2],int** rx_displacement[6])<br>{ int i,j,k=0,int **arr=*rx_displacement;<br>&nbsp;&nbsp;for (i=0;i&lt;4;i++)<br>&nbsp;&nbsp;{ for (j=0;j&lt;2;j++,k++)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(k=X)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{ arr[k]=&u_position<i>[j];<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;printf(&quot;rx_displacement[%d]=%d\n&quot;,X,*(arr[k]));<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<br>&nbsp;&nbsp;}<br>}<br>&nbsp;<br><br>pruébalo y escríbeme a <A HREF="mailto:rolandocente@latinmail.com">rolandocente@latinmail.com</A> si aún tienes dificultades.<br><br><br>&nbsp;<br>