I'm new to Mathematica, and I'm using it as a tool to my studies, specially in graph theory. Now I have to simulate a random graph a number of times to make the statistical analysis of these simulation runs, but I got into one problem, which is the fact that whenever I open and evaluate the notebook, Mathematica evaluates the cell with the simulation runs, thus changing the graphs being analyzed. How can I make the cell be evaluated just once and store the graphs for future uses?
Highlight the bar on the right next to the cell you want to not evaluate. Then on the notebook's menu, go to Cell - Cell Properties - Evaluatable and deselect it. Here's a shot of a Plot[ ] function where I highlighted the right vertical bar. You can see the Cell menu item above it.