> definitions of data.frames vs. matrix vs vectors. I have read many R. > tutorials, and looked over ump-teen 'cheat' sheets and have found that. > no one has articulated a really good definition of the differences. > between 'data.frames', 'matrix', and 'arrays' and even 'factors'.
Medical Definition of Tumor Our Tumor (Grade) Main Article provides a comprehensive look at the who, what, when and how of Tumor (Grade) Tumor: An abnormal mass of tissue. Tumors are a classic sign of inflammation, and can be benign or malignant (cancerous). There are dozens of different types of tumors. Their names usually reflect the kind of tissue they arise in, and may also tell you something about their shape or how they grow.
Cyst. Tumor. Description. A cyst is a closed sac, having a distinct membrane and division compared to the nearby tissue. It may contain air, fluids, or semi-solid material. Tumors are unnatural lumps or growth formed by extra cells in the body. These tumors may be solid or fluid-filled. Tumors are also called neoplasm. Occurrence