how can i make a function choose?

2018 4 19
1 个回答
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更新时间：2018 4 27
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0 个投票

If i had

DN= [[0.125 0.25 0.375 0.5 0.75 1 1.25 1.5 2 2.5];
OD=[0.405 0.540 0.675 0.84 1.05 1.315 1.66 1.9 2.375 2.875];
t=[0.068 0.088 0.091 0.109 0.113 0.133 0.14 0.145 0.154	0.203];

the above 3 matrix have the same no. of variables. and V varies from 1.5 to 3

ID = sqrt(4.*Q.* 0.000011574074./(pi.*V));
OD = ID + 2.*t;

and i need the OD function choose a the next large number from matrix above. Then align ID , t , DN with it.

11 个评论
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Star Strider
Star Strider 2018-4-19

What are ‘Q’, ‘V’, and ‘v’?

Mahmoud Sami
Mahmoud Sami 2018-4-19
There is one V ( mistake type) Q is input no say 1054
Amjad Green
Amjad Green 2018-4-19
if i understood your question right
try F=[OD ID' t' DN']
Star Strider
Star Strider 2018-4-19

‘V varies from 1.5 to 3’

Does this mean, for example:

V = 1.5 : 0.5 : 3;

or something else?

Mahmoud Sami
Mahmoud Sami 2018-4-20
V=1.5:0.1:3; ID, OD, t, DN is the required
Mahmoud Sami
Mahmoud Sami 2018-4-20
@Amjad Green I can't understand the answer
Jan
Jan 2018-4-21
@Mahmoud Sami: I do not understand your question. What is the wanted output for the given example input? What does "align" mean? What is "next large number"?
Mahmoud Sami
Mahmoud Sami 2018-4-21
@Jan The output in that function is ID (Internal pipe diameter ). But ID=OD-2t t and DN is vectors and there must be chosen from it. SO if you get ID no say 10 so OD and t will have numbers but out of vectors so step froward to take the number is the vector more large than that number. I wish i could inform you more simple.
Mahmoud Sami
Mahmoud Sami 2018-4-21
I can try to simplify it. DN, t, & OD is ASME standard, V is velocity Q is discharge. V is recommended to vary from 1.5 to 3 so i must choose the above variables from ASME table that get make V (1.5 to 3) and the relation connect them is ID = sqrt(4.*Q.* 0.000011574074./(pi.*V)); & OD = ID + 2.*t; So if OD get no not in table i must choose the higher one then ID be changed.
Jan
Jan 2018-4-21
@Mahmoud Sami: I do not have any idea of what "ASME standard" is. I do not understand the meaning of the other sentences of your comment also. Again: What is the wanted output for the given example input?
Mahmoud Sami
Mahmoud Sami 2018-4-21
if i have F=[OD ID' t' DN'] as above comment I need 4 variables in that matrix with condition for V (1.5 :3 )

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 采纳的回答

Walter Roberson
Walter Roberson 2018-4-21

1 个投票

"and i need the OD function choose a the next large number from matrix above. "
interp1() with the 'next' option.

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Mahmoud Sami
Mahmoud Sami 2018-4-25
编辑：Walter Roberson 2018-4-25
I have Eq.
ID= (4.*Q./(pi.*V)).^0.5;
Q and V is given no.
but need ID to be selected from table, if any other answer can be rejected or choose the nearest large no. of it.
let's say
ID =[0.0134 0.0403 0.0769 0.1023 0.1213 0.1523 0.2031 0.2570 0.3118 0.3436]
and V vary from 1.5 to 3 Q=0.2
Walter Roberson
Walter Roberson 2018-4-25
bin = discretize( Computed_ID, List_of_Valid_ID, 'IncludedEdge', 'right');
adjusted_ID = List_of_Valid_ID(bin);
Mahmoud Sami
Mahmoud Sami 2018-4-27
编辑：Mahmoud Sami 2018-4-27
That's great it do what i need. Please can you help me in the next part of the question. If we put all listed Value of ID, DN, t, OD in a matrix F=[DN; OD; t; ID] then we get the adjusted ID from the above answer, how can we get the others separately .
Walter Roberson
Walter Roberson 2018-4-27
I don't think I understand the question?
Mahmoud Sami
Mahmoud Sami 2018-4-27
编辑：Walter Roberson 2018-4-27
That is the actual table
DN=[15,20,25,32,40,50,65,80,100,150,200,250,300,350,400,450,500,550,600,650,700,750,800,850,900,950,1000,1050,1100,1150,1200];
OD=[21,26,33,42,48,60,73,89,114,168,219,273,324,355,406,457,508,559,610,660,711,762,813,864,914,965,1016,1067,1118,1168,1219];
t=[2,3,3,4,4,4,5,5,6,7,8,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10];
ID=[17,20,27,34,40,52,63,79,102,154,203,255,304,335,386,437,488,539,590,640,691,742,793,844,894,945,996,1047,1098,1148,1199];
for every single value in ID there is a value in t, DN, OD aligned with it without any mathematical relations so your code get me ID. Is there any method to get the other values
Walter Roberson
Walter Roberson 2018-4-27
adjusted_OD = OD(bin);
adjusted_DN = DN(bin);
adjusted_t = t(bin);

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