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Incorrect data size in copy from device memory in tutorials/vector_addition.cu

Line 86 should read:
  cudaMemcpy(host_array_c, device_array_c, num_bytes, cudaMemcpyDeviceToHost);

Instead of:
  cudaMemcpy(host_array_c, device_array_c, num_elements,
cudaMemcpyDeviceToHost);

If you augment the current code to print the last few elements of the
result vector, you'll see they're currently all zero -- only the first
quarter of the output vector is copied from the device (assuming 4-byte float).

Original issue reported on code.google.com by [email protected] on 7 May 2010 at 8:09

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