KNITPRO ~ A great site to convert a picture into a chart/grid for crocheting. just upload your pic and it will make a chart for you. It says knitting but you can use it for crochet also, and its free! Awesome tool for tapestry crochet.
This is an image from this resource on the Internet4Classrooms' "Second Grade Math help on standardized tests, graphs, charts, diagrams" resource page: Dedicated Line Graph Generator. Create and print colorful graphs with your own labels, values, and colors.
Link to a free, online chart maker. It's not the best, but was pretty quick and easy to use. To print your chart, you have to hit the "Print Screen" button on your keyboard and then paste the image into an image editing program to crop and print. Not too bad of a program for free. Click on the "Visit their website" link to go to it.
*First Day of School Seating Chart Activity: Create a coordinate plane out of the desks. Use masking tape on the floor to create the x- and y-axes. Label the origin and explain which direction is up, down, left and right. As students walk in, give them a notecard with a coordinate on it. This is a handy way to review simple graphing on the first day, to see how students think, and randomize the seating chart.*
The Petersen graph is named for Julius Petersen, who in 1898 constructed it to be the smallest bridgeless cubic graph with no three-edge-coloring. Although the graph is generally credited to Petersen, it had in fact first appeared 12 years earlier, in a paper by A. B. Kempe (1886). Donald Knuth states that the Petersen graph is "a remarkable configuration that serves as a counterexample to many optimistic predictions about what might be true for graphs in general.
Pi-Knits #6. Used a picture with an online graph generator for pattern. Red Heart Super Saver yarn. 4 skeins blue & 3 skeins yellow. Doubled up on yarn. Size US 11 needles. Size 4x5. (Please ignore the beast) #Knitting #Blanket