zero

问题 I would like to understand how to set 0 value of the attribute when it is NULL with MAX function. For example: Name columns: number - date Values: 10 - 2012-04-04 11 - 2012-04-04 12 - 2012-04-04 13 - 2012-04-15 14 - 2012-06-21 1 - 2013-07-04 Number is incremental field, but it has set itself 1 when new year has come. But result of: SELECT (MAX(number)+1) number WHERE date LIKE "2014%" is NULL and not 1 because MAX(number) is NULL and not 0 回答1: Well, as there is no date like 2014, you would

问题 I am working with logarithmic scale in the y-axis I know that log(0) doesn't exist but I need to draw 0 values, and I need a log scale. I read in other answers that changing the zero values to null solve the problem, but it is not working for me. See the example: http://jsfiddle.net/QEK3x/15/ Thank you in advance. 回答1: Although not perfect, the best I came up with was to set the zero point to 0.0001 and then set the y-axis min to 0.0001: http://jsfiddle.net/6LHT8/ yAxis: { min:0.0001, type:

问题 I am working with logarithmic scale in the y-axis I know that log(0) doesn't exist but I need to draw 0 values, and I need a log scale. I read in other answers that changing the zero values to null solve the problem, but it is not working for me. See the example: http://jsfiddle.net/QEK3x/15/ Thank you in advance. 回答1: Although not perfect, the best I came up with was to set the zero point to 0.0001 and then set the y-axis min to 0.0001: http://jsfiddle.net/6LHT8/ yAxis: { min:0.0001, type:

问题 I am working with logarithmic scale in the y-axis I know that log(0) doesn't exist but I need to draw 0 values, and I need a log scale. I read in other answers that changing the zero values to null solve the problem, but it is not working for me. See the example: http://jsfiddle.net/QEK3x/15/ Thank you in advance. 回答1: Although not perfect, the best I came up with was to set the zero point to 0.0001 and then set the y-axis min to 0.0001: http://jsfiddle.net/6LHT8/ yAxis: { min:0.0001, type:

问题 I am having a problem with a small number. I am using SUM function to sum certain numbers. If I add a zero to the range, it is not displaying zero. I don't know why. A1 =SUM(B1:R1)*-1 C1 to L1 266864 -100000 -15136.15 -23688.82 -120870 -7169 -5550 1224 -0.03 4326 A2 =SUM(B2:R2)*-1 C2 to M2 =SUM(C3:C3) =SUM(D3:D3) =SUM(E3:E3) =SUM(F3:F3) =SUM(G3:G3) =SUM(H3:H3) =SUM(I3:I3) =SUM(J3:J3) =SUM(K3:K3) =SUM(L3:L3) =SUM(M3:M3) A3 =SUM(B3:R3)*-1 C3 to M3 266864 -100000 -15136.15 -23688.82 -120870

问题 I am having a problem with a small number. I am using SUM function to sum certain numbers. If I add a zero to the range, it is not displaying zero. I don't know why. A1 =SUM(B1:R1)*-1 C1 to L1 266864 -100000 -15136.15 -23688.82 -120870 -7169 -5550 1224 -0.03 4326 A2 =SUM(B2:R2)*-1 C2 to M2 =SUM(C3:C3) =SUM(D3:D3) =SUM(E3:E3) =SUM(F3:F3) =SUM(G3:G3) =SUM(H3:H3) =SUM(I3:I3) =SUM(J3:J3) =SUM(K3:K3) =SUM(L3:L3) =SUM(M3:M3) A3 =SUM(B3:R3)*-1 C3 to M3 266864 -100000 -15136.15 -23688.82 -120870

问题 How can I ignore ZeroDivisionError and make n / 0 == 0 ? 回答1: Check if the denominator is zero before dividing. This avoids the overhead of catching the exception, which may be more efficient if you expect to be dividing by zero a lot. def weird_division(n, d): return n / d if d else 0 回答2: You can use a try / except block for this. def foo(x,y): try: return x/y except ZeroDivisionError: return 0 >>> foo(5,0) 0 >>> foo(6,2) 3.0 回答3: I think try except (as in Cyber's answer) is usually the

问题 I have a matrix with rownames and colnames as: a = matrix(1:4,2,2) dimnames(a) = list(c("x","y"),c("x","y")) I can have access to matrix elements by rownames and colnames, for example, a["x","y"] When I type a["x","z"], it gives me an error "Error in a["x", "z"] : subscript out of bounds", which should be. My question is how can I get zero instead of that error. More precisely, when I type wrong rownames or colnames that are not in rownames(a) or colnames(a), it returns a fixed value such as

问题 I would like to count how many times my signal goes to zero. For example having an impulse signal as input I want a variable which counts how many times the impulse goes to zero. I´m becoming crazy thinking of something....can anybody help me? Thanks 回答1: figure 1 is a pulse counter model and figure 2 is scope output which shows for 5 input pulses we get counter output as 5 回答2: There is a similar question here that might help. There are loads of ways to implement a counter, but a good way I

问题 Recently started messing with AArch64 assembly and I noticed that it has an assigned register strictly for zero , whereas (most) other architectures you would just xor var, var . The site I was reading about zr explained it as a reference point for zero which sounds a lot like how I define ground in DC electronics. And because ARM is used by hobbyists, tying ground in the circuit to zero in the code kinda makes sense to me. I'm sure it's much more complex than this, but is this a safe analogy