The market runs in patterns, Jim Cramer said on his

"RealMoney" radio show Friday. It can tell you when it is time to buy and when it's time to sell, he said.

Friday is a textbook day, Cramer said. The market rallied

early because Europe did, and Europe rallied because we did. Then the market went down, he said.

"I like to only buy a stock when I can see the white in its eyes," he said.

"If you missed the opportunity to buy the stock yesterday you have to wait," Cramer said. "Just watch it and be patient."

"I like to buy the one or two stocks that did not rally," he said, adding that he believes any company that is in the machinery business could do well. Cramer also told listeners to take a look at the oil or supermarkets.

If you stay in machinery, oil or supermarkets you should be fine, but there are some consumer stocks that are being given up, he said.

To see the most recent edition of The RealMoney Radio Recap in its entirety, please click here. This recap is published every day around 3 p.m. ET.

Jim Cramer is a director and co-founder of TheStreet.com. He contributes daily market commentary for TheStreet.com's sites and serves as an adviser to the company's CEO. Outside contributing columnists for TheStreet.com and RealMoney.com, including Cramer, may, from time to time, write about stocks in which they have a position. In such cases, appropriate disclosure is made. To see his personal portfolio and find out what trades Cramer will make before he makes them, sign up for

Action Alerts PLUS. Listen to Cramer's RealMoney Radio show on your computer; just click

here. Watch Cramer on "Mad Money" at 6 p.m. ET weeknights on CNBC. Click

here to order Cramer's latest book, "Real Money: Sane Investing in an Insane World," click

here to get his second book, "You Got Screwed!" and click

here to order Cramer's autobiography, "Confessions of a Street Addict." While he cannot provide personalized investment advice or recommendations, he invites you to send comments on his column by

clicking here.

TheStreet.com has a revenue-sharing relationship with Traders' Library under which it receives a portion of the revenue from Traders' Library purchases by customers directed there from TheStreet.com.