2 years, 79 days

## @Carl Love  Dear friend, Thank you...

Dear friend,
Thank you so much.
I had not paid any attention to these points that you mentioned.
Your knowledge in this field is very deep and you think professionally.
Many thanks for your explanations and clarifications.

## @Carl Love Dear friend,Thank you so...

Dear friend,

Thank you so much.

Yes, you are right. the previous did not work for the boundary condition.

But this one works. Also, the first issue (introducing the constant) works.

Thank you very much.

It is interesting to know that using convert((D[1\$3](y))(a, t), diff), both

D[1\$3](y)(a,t) = V

and

eval(diff(y(x, t), x\$2), [x = a]) = V

have the same result, but the former one works for boundary condition while the latter one does not work. However, by defining `a' as a constant, the latter one will work.

Thanks a lot.

## @Carl Love Dear friend,Many thanks ...

Dear friend,

Many thanks for your answer. I did not know these. You raised my knowledge.

Thanks a lot.

I want to use the aforementioned notation as a boundary condition for a differential equation.

Dear friend,

Thanks a lot.

## Thanks a lot....

Dear friend,

Yes, you are right. Thank you so much.

Best Regards,

J.

## Thanks a lot....

Dear friend,

Thank you so much. Thanks a lot for your nice and very clear explanations. You made me happy.

## Thanks a lot...

Dear friend,

Thank you so much.

I really do not know how I can appreciate you. Thank you very much for your time and efforts.

Thanks a lot.

## @acer Thank you so much for your an...

I tried for my problem with another code which is in the following. If it works, it solves my problem, but unfortunately, I received an Error.

Anyway, I am attaching the full file. You can consider it.

Error.mw

## @tomleslie Thank you very much. It'...

@tomleslie

Thank you very much.

It's exactly what I was looking for.

## @tomleslie Dear friend,Thank you ve...

Dear friend,

Thank you very much for your help.

The thing which I want is the 2D plot. You drew 3D.

Indeed, I want both "x" and "y" on the vertical axis and "z" on the horizontal axis. In other words, I want the graphs of "x-z" and "y-z" in one figure only.

## Thank you so much...

Dear Carl,

Thank you very much for your time and explanations.

Yours Sincerely.

## Thank you so much...

Thank you so much.

Your codes were very useful to me. I learned from them.

Thanks again.

Yours Sincerely.

## @deniscr  You are welcome:)...

You are welcome:)

## Thank you so much...

Your codes were clear such as the codes of "Carl Love 16581 " and I learned from it as well.

Thanks again.

Yours Sincerely

## @Carl Love  Thank you very much. ...

Thank you very much.

I really do not know how I can appreciate you.

Every time I put a question in this site, you answer it, You have a merciful heart and generous hand. Men such you show that humanity still exists in the world.

I wish the best for you.

Yours Sincerely.

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