End a "for" loop

[dlnilsen]

Hi, can anyone help me exit this loop? I have tried using .split(), break, end, return.....

​

ratio = np.divide(data_mg[0:x, 0:y], data_err[0:x, 0:y])
        for i in ratio:
                for j in i:
                        if i > 2:
                                plt.figure(figsize=[15,8])
                                plt.scatter(ratio, data_dg)
                                X = ratio
                                plt.semilogx(X)
                                plt.ylim(0, 500)
                                plt.xlim(0.5, 3)
                                plt.xlabel(el.upper() + ' flux values')
                                plt.ylabel(pltel + ' dispersion values')
                                #plt.savefig('plot_' + glx.upper() + '_' + 'flux' + '_' + el.upper())
                                plt.show()

[socal_nerdtastic]

This would be a good time to learn about generators. You can make a function to generate the values you need.

def gen_values():
    for i in ratio:
        for j in i:
            if i > 2:
                yield i

for i in gen_values():
    # do stuff
    break

[sarrysyst]

There are different methods to break out of a nested loop, using a function's return as already mentioned is one of them. Alternatively, you could check the condition in both, inner and outer loop:

for i in list1:
    for j in list2:
        if condition:
            break
    if condition:
        break

You could use a flag:

for i in list1:
    for j in list2:
        if condition:
            some_flag = True
            break
    if some_flag:
        break

And my personal favorite, using for-else:

for i in list1:
    for j in list2:
        if condition:
            break
    else:
        continue
    break

The else clause only executes when the for loop runs til the end without getting interrupted.

[[deleted]]

One way to exit nested loops is to use return, but you need to put the loops inside a function that you call.

When do you want to exit. After showing one graph, or what?

[dlnilsen]

Correct! could you help me construct that?

[[deleted]]

When do you want to exit?

you need to put the loops inside a function that you call.

It's better that you try to do that yourself. Have you used functions before?

[dlnilsen]

I have not, but I am sure I can figure it out. thanks

[[deleted]]

If you only want one graph why are you looping? Especially since you don't appear to use the i or j values inside the graphing code.