Chapter 242 (1/2)

“…… Therefore, the Helmholtz equation is bounded in a certain region, then in the waveguide, the solution of the equation can be expressed by a linear combination of discrete eigenmodes due to the limitation of boundary conditions

As for the compact difference scheme, it is simpler. It is a high-precision finite difference method. For example... ”

However, the difference scheme used to approximate the partial derivative at the discrete point Xi involves at least one more mesh number than the truncation error of the scheme In addition, it shows that the difference scheme has serious numerical dispersion. The compact difference scheme is different from the one shown above. It approximates the weighted average of the partial derivatives of the function at several grid points near the grid point XI by using the weighted average of the function values at several points near the grid point Xi

Cheng Nuo, like a family treasure, tells the three people his opinions. Let one side of the three people listen to a Leng a Leng.

Finally, Cheng Nuo raised his head humbly to Wang Ji, with a sincere attitude to ask for advice, ”schoolmaster, these things are just my humble opinions. Certainly, there are still many deficiencies, and I hope the senior students can give me some advice. ”

Wang Ji: ”it's just

Teaching? Give me a piece of wool!

Wang Ji looks at Cheng Nuo with speechless eyes at this time. He is in disorder in the wind and doesn't know what to say.

”Helmholtz equation” and ”compact difference scheme” are the two most important key words in their project.

As a matter of fact, before the issue was handed out to them, Wang Ji, a junior in several academies, had only heard a little about these two places.

That's the real one. I've only heard the name. It's not Cheng Nuo's ”a little bit of a hearing”.

To tell you the truth, Wang even doubted. In the two people's ideas, a little hearing represents a completely different level.

Even if Cheng Nuo said that a lot of things, absolutely can not be summed up with ”a little hearing”.

Cheng Nuo is over there. After talking for more than ten minutes, Wang Ji has listened to him carefully.

It can be said that what Cheng Nuo said is not a bit wrong, but also comprehensive. Wang Ji, who has been studying this topic for more than a month, doesn't even know some things.

As for teaching

Wang Ji, with a bitter face, looked at his two other comrades with a cry for help.

Help, guys!

But two people, did not seem to feel Wang Ji's eyes the same.

Zhuang dawning: ”elder martial brother, let's go to the first floor of the canteen for lunch. I heard that there is a new optional window, which tastes good.”

Jiang Shuobo: ”well, this is good. We'll go there together later.”

Wang Ji: ”ha ha...”

What about good friendship?

”Foundation student, are you ok?” Cheng Nuo sees Wang Ji that face constipation expression, voice asks a way. ”In fact, there are several bottles of Shenbao in my dormitory. Or I'll bring it to you next time. Liuwei Dihuang pills are also available. ”

“……” Wang Ji waved his hand, ”I'm ok, we'll continue.”

Wang Ji turned around, carrying his hands on his back, and looked enigmatic, ”what you know about these two terms is only skin deep. I won't tell you anything. Because even if I said it, I'm afraid you can't understand it in a moment and a half. I have never advocated cramming education. ”

”So, in the next period of time, you can follow the three of us and study this project. It is estimated that after the project, you will have a deeper understanding of the two nouns

Cheng Nuo's standard Mengxin student nodded, ”OK, senior.”

It's a close call. The face of the schoolmaster is finally saved.

Wang Ji wiped the sweat on his forehead.

”What is my specific task, senior student?” Cheng Nuo asked, and then added, ”by the way, is there any research progress on this subject?”

Wang Ji turns around and sits opposite Cheng Nuo, scratching his head. He says, ”for more than a month, because the three of us are busy with other things, it shows that at present We just put together the general framework of the project. ”

”As for the specific content filling, if we calculate it according to the progress, it is not yet 5%。”